Error after installing plugin

[arunsworld@…]

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/trac/web/api.py", line 440, in send_error
    data, 'text/html')
  File "/usr/lib/python2.7/dist-packages/trac/web/chrome.py", line 832, in render_template
    template = self.load_template(filename, method=method)
  File "/usr/lib/python2.7/dist-packages/trac/web/chrome.py", line 793, in load_template
    self.get_all_templates_dirs(), auto_reload=self.auto_reload,
  File "/usr/lib/python2.7/dist-packages/trac/web/chrome.py", line 506, in get_all_templates_dirs
    dirs.extend(provider.get_templates_dirs() or [])
  File "build/bdist.linux-x86_64/egg/lightertheme/__init__.py", line 73, in get_templates_dirs
    return ["lightertheme", resource_filename(__name__, 'templates')]
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 904, in resource_filename
    self, resource_name
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1380, in get_resource_filename
    return self._extract_resource(manager, zip_path)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1391, in _extract_resource
    zip_stat = self.zipinfo[zip_path]
KeyError: 'lightertheme/templates'

[Jun Omae]

A duplicate of #11582.