"can't unmothball"??

[AMF]

OK, I have, over the past few turns gotten "Our vehicle XX in system YY cannot by unmothballed because we don't have enough resources"

I've confirmed over the past 4 turns that I do, indeed, have enough resources - in fact, I have oodles and oodles of resources, far more than I need. The ships are already mothballed, and they are over a shipyard. I can see no reason why this would be happening. Anyone else ever see this? Am I just missing something basic (having unmothballed a lot in my time, I think not, but who knows...)?

ANy help appreciated,

thanks,

Alarik

EDIT: I am using 1.91 Stock, but it was happening before in 1.84.

[ March 06, 2004, 17:33: Message edited by: alarikf ]