It would be helpful to also post where you create the hash. Generally speaking, when you have code like this:

my %uberhash=(1,2,3,4);
sub a {
  my %hash=(1,2,3,4);
}

sub b {
  #can see %uberhash
  #can't see %hash
}
[download]

%hash is not seen anywhere but in sub a because 'my' creates variables local to a block (and a subroutine aka function creates a block. Remedies: You could create the variable with 'our' instead of 'my' making the variable globally accessible, or add something like 'my %hash;' outside of the subroutine.

Another possibility would be to return the hash contents as function result and assign that to a globally accessible variable