This is the piece of code I am using. 


if( any { /^\Q$req_type{$req_id}\E$/ } @req_reqest)
        {
                $OTAF_data{$req_type{$req_id}}++;
                $OTAF_hour_stats{$start_hour}{'Total_calls'}++;
                $OTAF_data{'Total'}{'Total'}++;
                if ($status eq "0")
                {
                        $OTAF_data{'Failure'}{$req_type{$req_id}}++;
                        $OTAF_data{'Errors'}{$db_error}++;
                        $OTAF_data{'Total'}{'Success'}++;
                }
                elsif ($status eq "1")
                {
                        $OTAF_data{'Success'}{$req_type{$req_id}}++;
                        $OTAF_data{'Total'}{'Failure'}++;
                }
        }

[download]

Like this I am building a hash with all the information I needed. Later I want the error name which occured. For that I am using "keys"


my @occured_errors = keys $OTAF_data{'Errors'};

[download]

If there are no errors present on the day. Its showing an error  Type of argument to keys on reference must be unblessed hashref or arrayref at ./OTAF_Statistics_Report.pl line 184.

How to solve this problem???

In reply to Check either keys are exists by ravi45722

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