I have exactly the same bug Same error message. I thought it was since "useparkedplanes" failed to find any A-20Cs in the templates, but it persisted even after I unchecked useparkedplanes... I also replaced the A-20Gs on the ground with C models in the templates, yet he still couldnt pick up a base.... I have the bad feeling that all my bases can't be picked up and aren't belong to me yet :p
"War is the most dangerous thing that can happen to an army. It destroys discipline, makes soldiers look dirty, stains clothes and damages equipment. It is therefore to be avoided at all costs" - � 1, electoral saxon military doctrine, 1750