The diff of the two versions of REDMINE reports an error 500 error

Redmine has the svn version comparison function. When the diff of version comparison reports error 500, the reasons are as follows:

 

The reason is the permission problem of tmp/cache

Since redmine's tmp is under the root group, you need to change /opt/redmine-2.3.2-2/apps/redmine/htdocs/tmp/cache to 777 permissions, the problem is solved.