Constantly crashing during last step of loading in Single Player?

[ShadowDialga]

I've tried about 10 times to launch single player and it crashes to steam without any error messages each time. I've

* Uninstalled all the addons I've downloaded since it last worked that have <1000 upvotes

* Verified the game cache

* Uninstalled and re-installed Gmod

* Disabled and re-enabled all the addons

Still nothing. What do?

[editline]4th October 2014[/editline]

NVM I uninstalled some more add ons and it works (on flatgrass anyway)