[Twister]

Whenever the V1 is set to fly, via FMB, I get the following error (all OK via QMB):

Mission Loading failed:
Weapon set 'Default' not Registered in air.Fi_103_V1

I am using U1.2 and all has been OK with other aircraft mods.

Air.ini and Plane_RU.properties have been updated as per instructions on page 1.

Help, I'm stuck this time.

Did the same thing with same result. Perhaps, it was not so good idea to not mading "default" weapon loadout for AC. But this issue is not fatal.
Simlpe way to overcome it is just to open the page of object properties there weapon loadout is. Now FMB sets displayed loadout for the craft ("warhead").
Otherwise, it sets "default", and mission not loading. This is my bug, or FMB, or both, as U like.
Don't forget to save your mission afterwards.