Post the hash you are using. so we can help you better.

From the error message you posted, it seems you are trying to access a data structure as hash reference, but it doesn't hold a reference to a hash.

It might be useful to dump your data structure to figure out what it actually is.

use Data::Dumper;
print(Dumper($datastructure));
[download]

Post us the output of the Dumper() here and tell hash which part you are trying to access.