Canon FTB meter

Question

I have not used by FTB for several years and now my daughterneeds
to use it for a hi school photo class. The meter wasworking fine
to start with but after removing old film from who knowshow long ago,
the aperture needle will not move from the lower cornerwhen adjusting
f-stops. I replaced the battery to make sure theproblem wasn't
there and loaded fresh film. Still the apertureneedle doesn't
move. I have tried with different lenses (to besure that i didn't
have a damaged one) still no difference. What am I
missing????