Well, yes, there's a rather easy fix. $self is a reference to the actual hash. You can convert ("dereference") it by writing %$self instead of %self (which is a variable of its own).
However, a better approach would be to use one of Perl's modules for that. Data::Dumper is in Perl core, Data::Dump or Data::Print need to be installed using your package manager or CPAN and provide "nicer" output. For Data::Dumper, use:
use Data::Dumper;
print Dumper $self;
print Dumper $args;
print Dumper $e;
That should go a long way.
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