Error whenever I try to compile a certain model

So I promised Half Health that I’d make a model hack for him. I did the hacking in MS3D, but when I try to compile I get this shit:

writing C:\Program Files\Steam\steamapps\blairmonster\garrysmod\garrysmod\models/Characters\officer\officer.mdl:
Error opening C:\Program Files\Steam\steamapps\blairmonster\garrysmod\garrysmod\models/Characters\officer\officer.mdl! (Check for write enable)

So, do any of you kids know what to do here?

oh and yes, im still working on that comic I said I’d make if you were in the chatroom when Spontaneous joined.

It means the directory that you’re trying to write the model to either doesn’t exist or is read only.

I had certain problems with directorys… Sometimes the studiomdl.exe can create folders, sometimes not.
I fixed this by creating all the folders on my own.

StudioCompiler can only create the folders if it’s only 1 folder. It can make models/cocks, but not models/cocks/dicks. Just make all the folders yourself.

Studiomdl makes all the folders for me when I compile stuff.