Update Data Extension with keyword in Mobile Connect Text response

I was trying to trigger a specific MobileConnect text response keyword which should update a Data extension. When I add some ampscript to the outbound response, I get an error saying "There was an error processing your message".

Any ideas?

%%[ Var @messageif (Uppercase(MSG(0).VERB) == "LATER") then Set @message = "Thank you"InsertData('Mobile_Response', 'MobileNumber', MOBILE_NUMBER, 'Keyword', "LATER", 'Response', MSG(0).NOUNS)else Set @message = "Sorry"endif]%% %%=v(@message)=%%