Not letting me in mods

[DumDuck 0]

so in the start up launcher i go to mod, im in a unit you see so i have to have certain mods to go with missions. but now it wont even let me select my mods and says "exit game to modify mods".So to fix this i went to my steam and looked and yep it said arma was running. but i never ran it. then i went to task manager and nope its not their. so i restarted my computer and its the same problem.Maybe i messed up a file or something while going into the mods folder.i don't know so if anyone can help it would be a huge relief