What's the full path you provided for the GMod directory if there's nothing private in the directory name? I'm not sure if spaces in directory names causes it to fail or not or something else but you can try to see
Hello, i fixed the probelm by installing
https://www.microsoft.com/en-US/download/details.aspx?id=6041
and
https://www.microsoft.com/en-us/download/details.aspx?id=26347
Thanks for trying to help me :)