First of all, thanks for your reply. I changed all variables $element to $node and errors I reported are gone. But unfortunately a new one came.
Not a HASH reference at line: if ($node->{type} eq 'e'). I think it's because of the $tree variable is ARRAY, but there is the main problem. My brain cannot really understand how to go threw an array of hashes and print it's elements.
Should I write something like
if(ref($node) eq HASH) do the code I have
elsif(ref($node) eq ARRAY) $node = shift;
?
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