I was recently trying to implement a CLR function in one of my dbs. I deployed and was about to test when i got the error that CLR is not enabled in system and its required for running .NET code. I used sp_configure for enabling clr as follows
sp_configure ‘clr enabled’,1
and got message as below
Configuration option ‘clr enabled’ changed from 0 to 1. Run the RECONFIGURE statement to install.
While running RECONFIGURE I got below error
Msg 259, Level 16, State 1, Line 1
Ad hoc updates to system catalogs are not allowed.
More details can be seen in below MSDN link