I had this same problem and I just fixed it. Heres what you need to do.
1. Go to C:\Program Files\MTA San Andreas\server\mods\race
2. Copy all those files. It should have a Maps folder, mtaserver, mtaserver.conf, race.dll, vehiclecolors.conf
3. Paste those 5 files to C:\Program Files\MTA San Andreas\mods\map_editor
That should resolve any issues you have. If It doesn't help let me know.