found this
Valid on all supported operating environments.
Symptom:
When I log in to the CA APM home page, none of the links on the page works. I receive
the following error message:
Error: (System.InvalidOperationException: Unable to generate a temporary class
Solution:
Correct this problem by following the instructions from Microsoft.
Follow these steps:
2. In the Search field, enter 908158.
3. In the results list, select the article with the following title:
Error message when ASP.NET 2.0 is configured to run with a user account: "Unable
to generate a temporary class".
4. Follow the instructions in the article.