the slashes for the directory seem to be different than the other pathes (like how VTFCmd is using "/" while the Gmod directory is using "\" instead), try changing the slashes to be consistent with the rest of the file paths and see if it works
This kind of issue is pretty difficult to test since the details I could find on the error code internally lacks any reason as to what is happening and it's not happening on my machine, the best guess I can make is that there might be some permission issues in that specific directory, although the temporary directories that had to be created for the compilation to work were probably created given the path I saw. Although this is a pretty weird error and I'm not sure if it's a problem with your system or not, try to see if there's something causing issues with apps not being able to create directories in that path
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 :)