Using custom files in Portal 2

I know its called TF2Maps and not Portal2Maps but they arent that different.
I was making a map with Portal 2 Authoring Tools - Beta and i used custom models and textures (from hl2 cuz for some reason they arent in Portal2). They show up in hammer however when i want to Launch the map in Portal 2 i get kicked from the server.

After i got kicked from the server i tyoed again map <mapname> and then it worked. Idk why but everytime i ask something (except one time) i find the answer shortly after i post xD