fetchrow_hashref gives error

hello everybody:

when I do fetchrow_hashref after execute it gives error:

DBD::mysql::st fetchrow_hashref failed: fetch() without execute()
*********lines where error*****************
$sth->execute();
$ref=$sth->fetchrow_hashref;
*******************************************

and why is this error emerging...

Use of uninitialized value in numeric eq (==)
******************line where error*******************
if ($equal_date==1)
*****************************************************

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