It's not due to a no CD crack. No-CD cracks are used on the exe, not the scm files.
Try reinstalling MTA like it says. If that doesn't work, uninstall MTA, uninstall GTA (make sure ALL files have been deleted) and reinstall both. You might want to back up your single player savegames (if you have any) before you do this. They are located in your My Documents folder.