Internal Server Error

Galaxy was unable to sucessfully complete your request

URL: http://ec2-54-226-209-68.compute-1.amazonaws.com/admin_toolshed/prepare_for_install?tool_shed_url=http://toolshed.g2.bx.psu.edu/&repository_ids=8aa7aee9b90e1791&changeset_revisions=1ee0b1ecf500
Module galaxy.web.framework.middleware.error:149 in __call__
>>  app_iter = self.application(environ, sr_checker)
Module paste.recursive:84 in __call__
>>  return self.application(environ, start_response)
Module paste.httpexceptions:633 in __call__
>>  return self.application(environ, start_response)
Module galaxy.web.framework.base:132 in __call__
>>  return self.handle_request( environ, start_response )
Module galaxy.web.framework.base:190 in handle_request
>>  body = method( trans, **kwargs )
Module galaxy.web.framework:221 in decorator
>>  return func( self, trans, *args, **kwargs )
Module galaxy.webapps.galaxy.controllers.admin_toolshed:896 in prepare_for_install
>>  common_install_util.get_dependencies_for_repository( trans, tool_shed_url, repo_info_dict,includes_tool_dependencies )
Module tool_shed.util.common_install_util:84 in get_dependencies_for_repository
>>  installed_rd, missing_rd = get_installed_and_missing_repository_dependencies_for_new_install(trans, repo_info_tuple )
Module tool_shed.util.common_install_util:190 inget_installed_and_missing_repository_dependencies_for_new_install
>>  tool_shed, name, owner, changeset_revision, prior_installation_required =suc.parse_repository_dependency_tuple( rd_tup )
Module tool_shed.util.shed_util_common:1106 in parse_repository_dependency_tuple
>>  prior_installation_required = str( prior_installation_required )
UnboundLocalError: local variable 'prior_installation_required' referenced before assignment