I could get this problem solved by repairing the Visual Studio 2008. Thanks MickB.
However, I get an unhandled exception during the execution of the current web request, with the following details:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error: (in Globals.cs)
Line 61: {
Line 62: ENTUserAccountEOList users = new ENTUserAccountEOList();
Line 63: users.Load();
Line 64:
Line 65: cache.Remove(CACHE_KEY_USERS);
Is there a possibility of getting rid of this, if I start with the next chapter, i.e. Exception Handling?