Traceback (most recent call last):


 "/usr/lib/calibre/calibre/customize/ui.py", line 171, in _run_filetype_plugins

nfp = plugin.run(nfp) or nfp


 "calibre_plugins.dedrm.__init__", line 625, in run


 "calibre_plugins.dedrm.__init__", line 575, in KindleMobiDecrypt
DeDRMError: DeDRM v6.8.0: Ultimately failed to decrypt after 0.1 seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/DeDRM_tools/blob/master/FAQs.md

Traceback (most recent call last):


 "/usr/local/bin/pipenv", line 11, in <module>

sys.exit(cli())


 "/usr/local/lib/python2.7/dist-packages/pipenv/vendor/click/core.py", line 722, in __call__

return self.main(*args, **kwargs)


 "/usr/local/lib/python2.7/dist-packages/pipenv/vendor/click/core.py", line 697, in main

rv = self.invoke(ctx)


 "/usr/local/lib/python2.7/dist-packages/pipenv/vendor/click/core.py", line 1066, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))


 "/usr/local/lib/python2.7/dist-packages/pipenv/vendor/click/core.py", line 895, in invoke

return ctx.invoke(self.callback, **ctx.params)


 "/usr/local/lib/python2.7/dist-packages/pipenv/vendor/click/core.py", line 535, in invoke

return callback(*args, **kwargs)


 "/usr/local/lib/python2.7/dist-packages/pipenv/cli.py", line 2057, in shell

do_shell(three=three, python=python, fancy=fancy, shell_args=shell_args)


 "/usr/local/lib/python2.7/dist-packages/pipenv/cli.py", line 1952, in do_shell

shell = os.path.abspath(PIPENV_SHELL)


 "/usr/lib/python2.7/posixpath.py", line 360, in abspath

if not isabs(path):


 "/usr/lib/python2.7/posixpath.py", line 54, in isabs

return s.startswith('/')
AttributeError: 'NoneType' object has no attribute 'startswith'
