Additionally, there are errors from a DarkRP script (DarkRP has been hacked together by too many authors for us to ever consider supporting it).
As Stickly asks, Please try with no other mods/gamemodes installed than default Gmod and default sandbox.
From server console, do a 'ulx debuginfo' for us too, as that console you copied is missing several/many lines of text.
We're not saying ULib/ULX is the 'only' mods people should run.
We're just unable to replicate the errors some have experienced, and need someone to assist us in finding whats breaking, most likely another mod or gamemode.