Gmod stops on "Loading Resources" when using my custom map

[hellsgate700]

I made a map for Counter Strike:Source using hammer. Then I saved and compiled the map. I copied the bsp and nav files to garrysmod/garrysmod/maps and the materials to garrysmod/garrysmod/materials. I played Gmod, played singleplayer on my map, and the loading screen got stuck on "Loading Resources". Any help is appreciated.

[LifeIsGood]

Try it in CSS.

[AmbidextrousPig]

Did you copy the soundcache and the graphs?