I just got hit with this. My computer doesn't show the Security section on properties.
Finally figured out I was trying to rebuild the cop y of the project on the network NAS. Switched to the one on my local hard drive and it rebuilt.
But now I get a few errors that it could not write to obj/Debug/.NETFramework,Version=v4.0.AssemblyAttributes.vb. I went to the Security tab, changed ownership and set full access, even deleted the files in Debug, and still get it. No write error for bin/Debug.
But the project runs fine.