2021-12-30T20:52:53,862 Created temporary directory: /tmp/pip-ephem-wheel-cache-4j6j56of
2021-12-30T20:52:53,868 Created temporary directory: /tmp/pip-req-tracker-_d5j7wwm
2021-12-30T20:52:53,868 Initialized build tracking at /tmp/pip-req-tracker-_d5j7wwm
2021-12-30T20:52:53,869 Created build tracker: /tmp/pip-req-tracker-_d5j7wwm
2021-12-30T20:52:53,869 Entered build tracker: /tmp/pip-req-tracker-_d5j7wwm
2021-12-30T20:52:53,870 Created temporary directory: /tmp/pip-wheel-21tirz63
2021-12-30T20:52:53,934 Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
2021-12-30T20:52:53,938 2 location(s) to search for versions of bookserver:
2021-12-30T20:52:53,938 * https://pypi.org/simple/bookserver/
2021-12-30T20:52:53,938 * https://www.piwheels.org/simple/bookserver/
2021-12-30T20:52:53,939 Fetching project page and analyzing links: https://pypi.org/simple/bookserver/
2021-12-30T20:52:53,941 Getting page https://pypi.org/simple/bookserver/
2021-12-30T20:52:53,944 Found index url https://pypi.org/simple
2021-12-30T20:52:54,208   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/21/b7/4922a1e6e08f5b50b4b19c53bb87fb8059ba90f25c700c940dc4fff64b50/bookserver-0.1.0-py3-none-any.whl#sha256=89c35dfbf752211f2dbd4ad64f4d5c3b5646f656830984f64decb736697f4ce2 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,210   Found link https://files.pythonhosted.org/packages/ac/3c/aa36c02e51850a1829280904c7c04f80b92f405cdf6ae91e51eb5d047bf2/bookserver-0.1.0.tar.gz#sha256=b263701edf12f5bc8e3a3c0c4ffc54d3b4a383a7751dc3341cc5af871be7361a (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.1.0
2021-12-30T20:52:54,211   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/ef/de/bb757cccd27438875bb9e3a713a3cf73762ea89636dd33ee2f41233e20b4/bookserver-0.2.0-py3-none-any.whl#sha256=d5e319203c6115424b465d3a28e81bf7395e4ce2ccde46717829855cde27e55d (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,213   Found link https://files.pythonhosted.org/packages/30/5c/6863b59cbf2e2c3df7d3ac797deedf5e7358819821379724889c8417ac9a/bookserver-0.2.0.tar.gz#sha256=325a2987f4e9fc0e17c03a19b09fd4f78718ad2fe0bde79d5ab5b1171e3bcd0d (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.2.0
2021-12-30T20:52:54,214   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/24/96/687777bd15814a580eab72285a404ab1109391471f07b4efcc085c0b10e3/bookserver-0.2.1-py3-none-any.whl#sha256=828c69910d1bd1777ec74f9f85f82271371459854933ff8e0ea0035dc992b509 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,215   Found link https://files.pythonhosted.org/packages/5c/04/f6c84a48501bbc24442e538167265e1285d8b12c7878565f8b8cf5492f4c/bookserver-0.2.1.tar.gz#sha256=6d69e8d869685ff38b4c3828e42e9dbd552eac643ef18332ed5861f33f3f5dd3 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.2.1
2021-12-30T20:52:54,216   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/74/e9/e51a81f3931ef83a0653187dcbd2bc1e22a3f3ac554ebb34af0b5c57a0c1/bookserver-0.2.2-py3-none-any.whl#sha256=1f63970a46d1e921b32c583f218440a32f0e2f3bfcd63fe22472002861c92221 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,217   Found link https://files.pythonhosted.org/packages/1e/9d/15d6d0d8c1330546a3d057bafac6ef25ad702978413e82618bf4eeb68336/bookserver-0.2.2.tar.gz#sha256=573bc27d11a1213f0f4b236585ec9f0e5503ab1ef8ac467c89b725e19837f89b (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.2.2
2021-12-30T20:52:54,218   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/51/10/4e9ec8dea33840c2d63130d3875c03df201c19cf6b93ed4290030841b36f/bookserver-0.2.3-py3-none-any.whl#sha256=7f857acaab4ed48fcbba4ba6de7eee5883e29b70ddb770a17151262fed646512 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,220   Found link https://files.pythonhosted.org/packages/36/01/770963544a9880b39aa32f4d65feb1f9cfa6538073b2c1d349ef28983fa2/bookserver-0.2.3.tar.gz#sha256=e607224903cfc5005322ff59693d27549ec27ece2c742ae80ad094056b17352a (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.2.3
2021-12-30T20:52:54,220   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/d3/c1/b873b4aee731d772e4671a8802fb3b93f104c013799b71a7e3d57c4a0c60/bookserver-0.3.3-py3-none-any.whl#sha256=7c1c2b19f372944a68f2efc0814c730420607679c2bfdf45cfe5fc8e3e452109 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,222   Found link https://files.pythonhosted.org/packages/52/3e/2ca2c38a8e939929f32a762b67a3ed4ec5a7790780adc308698ccdc2de92/bookserver-0.3.3.tar.gz#sha256=8caf45f9b44c6df705b8bcf72e2d47e429fafe9d80a77d62c9604d76fa0b073b (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.3
2021-12-30T20:52:54,222   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/3f/84/0af4bacf0a346ac5c4bb462561aa3745e4fea3bc4d6cd3e07eca5b616d1e/bookserver-0.3.4-py3-none-any.whl#sha256=c4645aeb17839f40a03aadc9baa2da84dd2cbcaca31a2952bbed19460f3693ca (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,224   Found link https://files.pythonhosted.org/packages/51/ff/4993e92b9833d7754974adf0b284b1af83b6309882b3b58dbbb93f87dd58/bookserver-0.3.4.tar.gz#sha256=83239d5c20e5030edac0a37dd87ef0d146c85777fa7f529bc135c9be27e13118 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.4
2021-12-30T20:52:54,225   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/6e/71/3a79d840c64d7e33cb59fd5b88874bfe7781f37bcbadb431ae2f53377560/bookserver-0.3.5-py3-none-any.whl#sha256=b7481f6187b355d1af705565944dc5412a901694a84a10951c3757bc5b78fa36 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,226   Found link https://files.pythonhosted.org/packages/a0/65/b0eead4238deb278ce38813a24f4876f1e376f8993dedc089fe88c2307c7/bookserver-0.3.5.tar.gz#sha256=d4a2c112ff0f8967c5eec69851de87a8328ae845cc3ad82d5db7381068578849 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.5
2021-12-30T20:52:54,227   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/a0/e8/b7c8df04a066af0358e49001fed05564258f1a569c811b0f135f994571f1/bookserver-0.3.6-py3-none-any.whl#sha256=5285bfa14b90e39d348cfe71049b54edef4ce889c1e9c36adec95787b02127ed (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,228   Found link https://files.pythonhosted.org/packages/0a/d2/ac89ead80c49fd5f0511d1c2b2fe19018e9d5dbad31f2adcc8b07e9542cb/bookserver-0.3.6.tar.gz#sha256=1817abb3f6cfbdea512455836f41cd2482cee9bc1b79268b4bc71f10aa268568 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.6
2021-12-30T20:52:54,229   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/3d/6f/3f16f4c2c3b37626b68f76ef4d76db8755f3e8d2c22d96d7d150c7960f44/bookserver-0.3.7-py3-none-any.whl#sha256=b1d02bbbc02762c9e0e5d09d656a4bd1b273245d4257213f3d6278e9a5619bfb (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,230   Found link https://files.pythonhosted.org/packages/d4/4f/124c25249e6a551572a3a38b2b63b6ad7dbd2f1aa124b91df61fa71ffbfa/bookserver-0.3.7.tar.gz#sha256=b2847db3ba0c7d88b797e36325eaf3863f9dca5b7757071e09aec8c84b853c6f (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.7
2021-12-30T20:52:54,231   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/db/d3/f58fea4bc2636f799d58c5e93944da57d18c70eea4b98e9fb2604dab40a4/bookserver-0.3.8-py3-none-any.whl#sha256=5b26ada8ca65ecafe91eb089a9bc213e80ec8bd6d8b35102b19817a6e47b2e85 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,233   Found link https://files.pythonhosted.org/packages/22/27/460e48c1540620fd52ad81dacd4b1561479ad0ff81cb2db1f511a61e0be8/bookserver-0.3.8.tar.gz#sha256=24f25b298d6a38324e05fd7106d415e40fbf1590907eda0d7e34174257dda669 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.8
2021-12-30T20:52:54,233   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/8a/46/c6ddc88a94e4677d2f3620cc749b61ef51fdfd5a758bfadf5a4ef59c422c/bookserver-0.3.9-py3-none-any.whl#sha256=6af66d2b7ee2dfb40f501a7e1ead57970ac1d77242779e3fe2ebaa1186f5655e (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,235   Found link https://files.pythonhosted.org/packages/3a/52/f2fd9c20a1114492b1726ad7bbcb01f0e10f078d9c3c480dbc7f70c640e3/bookserver-0.3.9.tar.gz#sha256=84d5fd361bef63b120128322ebd8f07ce520c818e7b94eb4f4a4c2e39d78f159 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.7,<4.0), version: 0.3.9
2021-12-30T20:52:54,235   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/09/f3/ababa6fe86a580301372019cef540693213bb827190c0835ac98ee34c318/bookserver-1.0.0-py3-none-any.whl#sha256=965b54b9450cca3ba73dde05f1b613831cc5029ad548611c52e6d48f92509309 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,237   Link requires a different Python (3.7.3 not in: '>=3.8.0,<4.0.0'): https://files.pythonhosted.org/packages/8f/ee/706f0ed3e6d0818d31aac0ed0b13a69a96927bfc5c255db7f2be736a252f/bookserver-1.0.0.tar.gz#sha256=d0c3e7788f84c70ed4e5d1b14713ed02607bffa7da1c3ad2078a66ab3999ef73 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,237   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/35/80/4ea991b0d556016731ab07472b7bd9c29f889c9ed4114c97ec9658e0121c/bookserver-1.0.1-py3-none-any.whl#sha256=1ebda721b2dca3b4b1172b36da2fbdf6ffb53950db9529bfa5fcdb09e04b1950 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,239   Link requires a different Python (3.7.3 not in: '>=3.8.0,<4.0.0'): https://files.pythonhosted.org/packages/02/eb/1a1c7572d68903d0c7035bf20a6c13991d72f99d57518eb02e1b1e463666/bookserver-1.0.1.tar.gz#sha256=fea3e78b5536c9519c0af0672c4ef8dd479882e0758689e6594eedf1d4c9d4b7 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,239   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/e3/91/a17a45ff6646dde2763f93f809062cde43cb53584e987829075a5ae7c7ab/bookserver-1.0.2-py3-none-any.whl#sha256=29f0dfa03a41def718bdf8f2ed9ad135a06fcb610a416f0c3f42401f83cb17c1 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,241   Link requires a different Python (3.7.3 not in: '>=3.8.0,<4.0.0'): https://files.pythonhosted.org/packages/7e/3d/914135e023b7b47d39959eeff15da7340981820faa065aff91833fbad44e/bookserver-1.0.2.tar.gz#sha256=2048d483be1cf9b7eee7858b9d7155d89cdc4270bf5c8c0115e1c43fad5cc60a (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,241   Skipping link: No binaries permitted for bookserver: https://files.pythonhosted.org/packages/99/e5/c02fbb57072bb757bfe4bf7d3926a758af225cb7f6fc8c0080a41ba34436/bookserver-1.0.3-py3-none-any.whl#sha256=cce296a0293aae1851c009e105dddd4239e0f16e6dbb5c1db8bc1cc9b9b63431 (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,243   Link requires a different Python (3.7.3 not in: '>=3.8.0,<4.0.0'): https://files.pythonhosted.org/packages/86/b0/9e8a8f2f1005810f34fc23576b66adf2cb993d348fef807326930bf16682/bookserver-1.0.3.tar.gz#sha256=31260fa9a8c1eec67fe04de7da36840642168d759e05f51bc8eddf9e186e853a (from https://pypi.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,244 Fetching project page and analyzing links: https://www.piwheels.org/simple/bookserver/
2021-12-30T20:52:54,244 Getting page https://www.piwheels.org/simple/bookserver/
2021-12-30T20:52:54,246 Found index url https://www.piwheels.org/simple
2021-12-30T20:52:54,472   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.1.0-py3-none-any.whl#sha256=89c35dfbf752211f2dbd4ad64f4d5c3b5646f656830984f64decb736697f4ce2 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,473   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.2.0-py3-none-any.whl#sha256=24fa3dae05db392058104dd8f1abb8e6098d955e6f30efc80b57ab89468bf8ed (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,473   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.2.1-py3-none-any.whl#sha256=d1cb5b5090ebf5a6837c4d422b72543451b80ea7f7c1fb8288871b26f7f186a3 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,474   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.2.2-py3-none-any.whl#sha256=d433baa8f67abe09ae1000876544cfc6d40766d984c7b6aca73cef194ed0bec6 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,474   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.2.3-py3-none-any.whl#sha256=cbc172baa996a21a0948c71e1d6ebf5b53886508083e19d62285a30e88dfc70b (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,475   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.3-py3-none-any.whl#sha256=7c1c2b19f372944a68f2efc0814c730420607679c2bfdf45cfe5fc8e3e452109 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,475   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.4-py3-none-any.whl#sha256=c4645aeb17839f40a03aadc9baa2da84dd2cbcaca31a2952bbed19460f3693ca (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,476   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.5-py3-none-any.whl#sha256=2bc300caf0b75150e45116eb22b652e89f54cc2c902b6aabd27d8d4193f98fbb (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,476   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.6-py3-none-any.whl#sha256=f75f585055d8b4db3ec66e7bc58618fb04d5dba626210b41653e5b836322a300 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,477   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.7-py3-none-any.whl#sha256=a9afd2c1a0564f2459f0d75a6ead27750570691330fe2ea5fd492e5c63f65c81 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,477   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.8-py3-none-any.whl#sha256=5b26ada8ca65ecafe91eb089a9bc213e80ec8bd6d8b35102b19817a6e47b2e85 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,477   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-0.3.9-py3-none-any.whl#sha256=6af66d2b7ee2dfb40f501a7e1ead57970ac1d77242779e3fe2ebaa1186f5655e (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.7,<4.0)
2021-12-30T20:52:54,478   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-1.0.0-py3-none-any.whl#sha256=965b54b9450cca3ba73dde05f1b613831cc5029ad548611c52e6d48f92509309 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,478   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-1.0.1-py3-none-any.whl#sha256=1ebda721b2dca3b4b1172b36da2fbdf6ffb53950db9529bfa5fcdb09e04b1950 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,479   Skipping link: No binaries permitted for bookserver: https://www.piwheels.org/simple/bookserver/bookserver-1.0.2-py3-none-any.whl#sha256=29f0dfa03a41def718bdf8f2ed9ad135a06fcb610a416f0c3f42401f83cb17c1 (from https://www.piwheels.org/simple/bookserver/) (requires-python:>=3.8.0,<4.0.0)
2021-12-30T20:52:54,480 Skipping link: not a file: https://www.piwheels.org/simple/bookserver/
2021-12-30T20:52:54,480 Skipping link: not a file: https://pypi.org/simple/bookserver/
2021-12-30T20:52:54,516 Given no hashes to check 0 links for project 'bookserver': discarding no candidates
2021-12-30T20:52:54,518 ERROR: Could not find a version that satisfies the requirement bookserver==1.0.3 (from versions: 0.1.0, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 0.3.8, 0.3.9)
2021-12-30T20:52:54,519 ERROR: No matching distribution found for bookserver==1.0.3
2021-12-30T20:52:54,519 Exception information:
2021-12-30T20:52:54,519 Traceback (most recent call last):
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 349, in resolve
2021-12-30T20:52:54,519     self._add_to_criteria(self.state.criteria, r, parent=None)
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 174, in _add_to_criteria
2021-12-30T20:52:54,519     raise RequirementsConflicted(criterion)
2021-12-30T20:52:54,519 pip._vendor.resolvelib.resolvers.RequirementsConflicted: Requirements conflict: SpecifierRequirement('bookserver==1.0.3')
2021-12-30T20:52:54,519 
2021-12-30T20:52:54,519 During handling of the above exception, another exception occurred:
2021-12-30T20:52:54,519 
2021-12-30T20:52:54,519 Traceback (most recent call last):
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/resolution/resolvelib/resolver.py", line 93, in resolve
2021-12-30T20:52:54,519     collected.requirements, max_rounds=try_to_avoid_resolution_too_deep
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 482, in resolve
2021-12-30T20:52:54,519     state = resolution.resolve(requirements, max_rounds=max_rounds)
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 351, in resolve
2021-12-30T20:52:54,519     raise ResolutionImpossible(e.criterion.information)
2021-12-30T20:52:54,519 pip._vendor.resolvelib.resolvers.ResolutionImpossible: [RequirementInformation(requirement=SpecifierRequirement('bookserver==1.0.3'), parent=None)]
2021-12-30T20:52:54,519 
2021-12-30T20:52:54,519 The above exception was the direct cause of the following exception:
2021-12-30T20:52:54,519 
2021-12-30T20:52:54,519 Traceback (most recent call last):
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/cli/base_command.py", line 164, in exc_logging_wrapper
2021-12-30T20:52:54,519     status = run_func(*args)
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/cli/req_command.py", line 205, in wrapper
2021-12-30T20:52:54,519     return func(self, options, args)
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/commands/wheel.py", line 144, in run
2021-12-30T20:52:54,519     requirement_set = resolver.resolve(reqs, check_supported_wheels=True)
2021-12-30T20:52:54,519   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/resolution/resolvelib/resolver.py", line 101, in resolve
2021-12-30T20:52:54,519     raise error from e
2021-12-30T20:52:54,519 pip._internal.exceptions.DistributionNotFound: No matching distribution found for bookserver==1.0.3
2021-12-30T20:52:54,527 Removed build tracker: '/tmp/pip-req-tracker-_d5j7wwm'