unable to connect/crashing

[Sommer]

Try Renaming The Folder to Gmod.new after that delete the folder and put server files in your Garrysmod>Garrysmod Folder

rename which folder? and delete which folder?

Computer > C: > Programs > Steam > Steamapps > (Username) > Garrys mod. Rename your garrysmodfolder to Garrysmod.new open your garrys mod and close it again. by that time you should have 2 folders. 1 named Garrysmod.new and one named Garrysmod. Delete The Garrysmod.new folder and reinstall the server files