diff viewer does not work after GitLab update, reviewboard version 1.7.27

Hi, we recently update our GitLab to 8.6.1 and now the 'View Diff' does not work anymore. It produces an error message like: Error: The patch to 'README' didn't apply cleanly. The temporary files have been left in '/tmp/reviewboard.2YSn1I' for debugging purposes. `patch` returned: patching file

Re: Reviewboard upgrade failure

All, I am trying to upgrade from 2.0.20 -> 2.5.3. I do this by taking a backup of the 2.0.20 database then importing into MySQL and then running the rb-site upgrade. However I get the following output: Updating database. This may take a while. The log output below, including warnings and e