.

lib/redmine/scm/adapters/gitlab_adapter.rb

@@ -16,7 +16,7 @@ module Redmine
         def initialize(url, root_url=nil, login=nil, password=nil, path_encoding=nil)
           super
           @g = Gitlab.client
-          @project = Project.find_by_url(url).gpid
+          @project = Repository.find_by_url(url).project.gpid
           @path_encoding = path_encoding.blank? ? 'UTF-8' : path_encoding
         end