timed out when loading..

everytime I try and play on a singleplayer game of garrys mod it makes it to the loading point “Finallizing game data” or whatever and then after a bit a box pops up saying <steam name> (my steam name :-:wink: has timed out and then wont let me play… and ive restarted steam. restarted garrys mod. and I still get the same message everytime its about to load in… anyone know the fix for this or whats causing this…

How much addons do you have?