“There was an error while performing this operation”

Question

I have a website in IIS for which I cannot open any of the settings like Authentication, Handler Mappings, Authorization Rules etc. It just shows the error message \"There was a

Answer 1

1. I just double click on the Application that have the error and
2. change the version of the .NET Framework and
3. then change it back to the original version and
4. recycled the App Pools.

e.g.:

The application has .NET Framework v4.0.30319 and I changed it to .NET Framework v2.0.50727 then the Status was turn into Stop, then I double click back and change to .NET Framework v4 and then right click recycle and recycled it.