You shouldn't install two different mods in the same dir, because mods can interfere with each other. I played a lot of mods and I do things like this: I have a clean RA2 folder and I copy that folder if I want to install a mod.
I suggest to reinstall the entire RA2 if you don't have a backup folder and then create 2 separate folders for each mod. I think it will fix the issue.
Well it didn't because i already tried it 3 times today.I tried only installing MO3 2 times didn't work,then reinstalling RA2 and RA2:YR and tried still didn't work.Then i reinstalled it again and tried with MO2 and still nothing ...