You're calling return_two_values() as a method, so the first argument is the object. Your code should read:
my ($self, $val1, $val2) = @_;
The $self variable here is a reference to your $new_module object.
Also, it's worth noting that your choice of variable name for your object reference isn't the best. The module here is "Learning" but the variable $new_module actually holds an object not a module. You might call this variable $new_object instead, to keep things clearer in your mind.
-sam
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