Man, you did little mistake at last line. Variable should not put into double/single quote during assignment to another variable. Here last line should be ...

$HashOfDataBase {"$IdFasta"} = $FastaSeqOfDataBase;

instead of ....
$HashOfDataBase {"$IdFasta"} = "$FastaSeqOfDataBase";#that is the line of the error
Hopefully this will resolve your issue.

In reply to Re: Use of uninitialized value error by bimleshsharma
in thread Use of uninitialized value error by birdy

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