Tanks and cooperative mode error

[CountZero]

I placed 3x _t34-76stz and 3x _pziii-l on empty mission and alow cooperative for each of  them, and save it as cooperative to see how coop works with tanks we have now. 

I can load mission in cooperative lobby, and then i can see all 6 tanks available to be selected, but when i or my tm8 try to take free slot it says error 10003 airplane not avialable for your acount...

 

I can play with thouse tanks in DF mode on server i or my tm8 host or on action tanks server or unprofesionals server with no problems, but it seams there is bug in coop mode for them, anyone els have this problem in cooperative mode only?

[NETSCAPE]

I added a co-op start tanks to a co-op mission I had already made. I received the same errors.