title: Getting pipenv internal error while trying to run this command " pipenv lock " with pycharm in mac OS
body: <p>I am new to python and pipenv. when I run <code>pipenv lock</code>,I got the following error, I have reinstall pipenv and search the error on google but I still can not fix the error. Last time when I opened the projects with pipenv it is ok, why now it is bad? Is there any relationship with oh-my-zsh?</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/lib/python3.7/site-packages/pipenv/project.py", line 527, in _parse_pipfile
      return tomlkit.parse(contents)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/tomlkit/api.py", line 49, in parse
      return Parser(string).parse()
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/tomlkit/parser.py", line 146, in parse
      key, value = self._parse_table()
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/tomlkit/parser.py", line 958, in _parse_table
      item = self._parse_item()
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/tomlkit/parser.py", line 270, in _parse_item
      return self._parse_key_value(True)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/tomlkit/parser.py", line 347, in _parse_key_value
      raise self.parse_error(UnexpectedCharError, "=")
  ** tomlkit.exceptions.UnexpectedCharError: Unexpected character: '=' at line 45 col 16 **
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/toml/decoder.py", line 456, in loads
      multibackslash)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/toml/decoder.py", line 678, in load_line
      raise ValueError("Invalid date or number")
  ValueError: Invalid date or number
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/usr/local/bin/pipenv", line 10, in &lt;module&gt;
      sys.exit(cli())
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
      return self.main(*args, **kwargs)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 717, in main
      rv = self.invoke(ctx)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 1137, in invoke
      return _process_result(sub_ctx.command.invoke(sub_ctx))
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
      return ctx.invoke(self.callback, **ctx.params)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
      return callback(*args, **kwargs)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
      return ctx.invoke(f, obj, *args, **kwargs)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
      return callback(*args, **kwargs)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
      return f(get_current_context(), *args, **kwargs)
    File "/usr/local/lib/python3.7/site-packages/pipenv/cli/command.py", line 301, in uninstall
      ctx=ctx
    File "/usr/local/lib/python3.7/site-packages/pipenv/core.py", line 2020, in do_uninstall
      ensure_project(three=three, python=python, pypi_mirror=pypi_mirror)
    File "/usr/local/lib/python3.7/site-packages/pipenv/core.py", line 574, in ensure_project
      pypi_mirror=pypi_mirror,
    File "/usr/local/lib/python3.7/site-packages/pipenv/core.py", line 494, in ensure_virtualenv
      python = ensure_python(three=three, python=python)
    File "/usr/local/lib/python3.7/site-packages/pipenv/core.py", line 394, in ensure_python
      python = project.required_python_version
    File "/usr/local/lib/python3.7/site-packages/pipenv/project.py", line 243, in required_python_version
      required = self.parsed_pipfile.get("requires", {}).get(
    File "/usr/local/lib/python3.7/site-packages/pipenv/project.py", line 509, in parsed_pipfile
      parsed = self._parse_pipfile(contents)
    File "/usr/local/lib/python3.7/site-packages/pipenv/project.py", line 531, in _parse_pipfile
      return toml.loads(contents)
    File "/usr/local/lib/python3.7/site-packages/pipenv/vendor/toml/decoder.py", line 458, in loads
      raise TomlDecodeError(str(err), original, pos)
  toml.decoder.TomlDecodeError: Invalid date or number (line 45 column 1 char 848)``
  
  when I run `pipenv update`, I got the same error
  </code></pre>