Missing class tables?

That's what it says when im trying to join a server.

edit: it says server uses different class tables. Any help? I don't know how to fix this.

 

Im also having problems but it says im missing "scriptssurfaceproperties.txt", then it said it cant open "dsp_presets" when i made a scripts surface txt.

 

Have you deleted the entire 1.9.0 tf2classic folder before you installed the new 2.0.0beta1 version?

 

ooooh i didn't know i had to run the beta version. i thought 1.9 was live. thank you!

 

i just have 2.0.0 beta, and I'm getting the same error.