I've upgraded a test site using: DNN_Platform_9.1.1.129-232_Upgrade

After the upgrade I can no longer uses the Content/Pages settings, I receive an internal server error popup, there is a message saying There was a n error retrieving content. Please check your internet connection. No information is written to the log file.

On the Manage/Users link I receive an internal server error and the same message on the internet connection.

Any help on this issue would be greatly appreciated.