Common language runtime (CLR) execution is not supported under lightweight pooling

0 Common language runtime (CLR) execution is not supported under lightweight pooling http://www.arcencus.nl/Default.aspx?tabid=105&EntryID=42 When trying to deploy some CLR-code I get the following errormessage: "Common language runtime (CLR) execution is not supported under lightweight pooling". ... nl-NL