xemacs problem

[Micha Feigin <michf@math.tau.ac.il>]

When I change the options in xemacs ( 21 latest ) to enable multiple
windows, and I try to compile or move to errors in the compilation, I get
the folowing error message:
wrong type argument : windowp, nil

any ideas?

Thanx
michf@math.tua.ac.il