2019-06-30T15:23:21 Created temporary directory: /tmp/pip-ephem-wheel-cache-8_4gxe2z
2019-06-30T15:23:21 Created temporary directory: /tmp/pip-req-tracker-a_nk588j
2019-06-30T15:23:21 Created requirements tracker '/tmp/pip-req-tracker-a_nk588j'
2019-06-30T15:23:21 Created temporary directory: /tmp/pip-wheel-ap9i_iyq
2019-06-30T15:23:21 Cleaning up...
2019-06-30T15:23:21 Removed build tracker '/tmp/pip-req-tracker-a_nk588j'
2019-06-30T15:23:21 ERROR: Invalid requirement: 'wtf-server==(latest release)'

2019-06-30T15:23:21 Exception information:
2019-06-30T15:23:21 Traceback (most recent call last):
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/packaging/requirements.py", line 93, in __init__
2019-06-30T15:23:21     req = REQUIREMENT.parseString(requirement_string)
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/pyparsing.py", line 1828, in parseString
2019-06-30T15:23:21     raise exc
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/pyparsing.py", line 1818, in parseString
2019-06-30T15:23:21     loc, tokens = self._parse( instring, 0 )
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/pyparsing.py", line 1562, in _parseNoCache
2019-06-30T15:23:21     loc,tokens = self.parseImpl( instring, preloc, doActions )
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/pyparsing.py", line 3752, in parseImpl
2019-06-30T15:23:21     loc, exprtokens = e._parse( instring, loc, doActions )
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/pyparsing.py", line 1566, in _parseNoCache
2019-06-30T15:23:21     loc,tokens = self.parseImpl( instring, preloc, doActions )
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/pyparsing.py", line 3536, in parseImpl
2019-06-30T15:23:21     raise ParseException(instring, loc, self.errmsg, self)
2019-06-30T15:23:21 pip._vendor.pyparsing.ParseException: Expected stringEnd (at char 20), (line:1, col:21)
2019-06-30T15:23:21 
2019-06-30T15:23:21 During handling of the above exception, another exception occurred:
2019-06-30T15:23:21 
2019-06-30T15:23:21 Traceback (most recent call last):
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/req/constructors.py", line 285, in install_req_from_line
2019-06-30T15:23:21     req = Requirement(req_as_string)
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_vendor/packaging/requirements.py", line 97, in __init__
2019-06-30T15:23:21     requirement_string[e.loc : e.loc + 8], e.msg
2019-06-30T15:23:21 pip._vendor.packaging.requirements.InvalidRequirement: Parse error at "'release)'": Expected stringEnd
2019-06-30T15:23:21 
2019-06-30T15:23:21 During handling of the above exception, another exception occurred:
2019-06-30T15:23:21 
2019-06-30T15:23:21 Traceback (most recent call last):
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/cli/base_command.py", line 178, in main
2019-06-30T15:23:21     status = self.run(options, args)
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/commands/wheel.py", line 137, in run
2019-06-30T15:23:21     self.name, wheel_cache
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/cli/base_command.py", line 268, in populate_requirement_set
2019-06-30T15:23:21     wheel_cache=wheel_cache
2019-06-30T15:23:21   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/req/constructors.py", line 296, in install_req_from_line
2019-06-30T15:23:21     "Invalid requirement: '%s'\n%s" % (req_as_string, add_msg)
2019-06-30T15:23:21 pip._internal.exceptions.InstallationError: Invalid requirement: 'wtf-server==(latest release)'