Some time ago we found this problem when you do not have Project license key and you try to access the Electronic Time Card in Enterprise Portal. While you click on the drop down of ”Category” field to select values it throws an error
Problem can be fixed in very wasy way: do not show field category to end user: Go to AOT \ Web \ Web files \ Web controls \ JmgEPJobRegistration and double click on it the edit window will apeare Look for line:
and replace it with
To apply changes you need to run AxUpdatePortal: http://msdn.microsoft.com/en-us/library/dd261467.aspx