MC 1.8.8

Ok, so I created a new profile running 1.8.8 so that I can join an outdated server. But every time I click play, MC never starts and I get this error:
CMS is deprecated and will likely be removed in a future release…

Anybody know hot to fix this?
I know I put 1.9.2 but there was no 1.8.8 tab, sorry.