in reply to Need help with binding event in Tk
Can't modify non-lvalue subroutine callSo whatever is giving you the error is trying to use whatever as an lvalue and whatever is not meant to be used as one. Tk::Error is reporting on it.
(F) Subroutines meant to be used in lvalue context should be declared as such, see Lvalue subroutines in the perlsub manpage.
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