Garry's Mod/Garrysmod Dedicated Server

Admins dont ban me if am on the wrong section but i need help with this.

I followed a tutorial on how to make a garrys mod dedicated server with HLDSUpdateTool.exe
So i did all that and waited for some painfull hours because my internet was acting gay that day.
Then when i was going to start the server and try to join it i get a error message after gmod crashes that says:

Engine Error

Couldn’t allocate any server IP port

I dont know what the problem is so all i can say is f**k. Help me some1.