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  1. or download this
    ...
my $obj_temp = "";
...
   "$obj_temp" if "$obj_temp";# print the error message
   $obj_temp =~ /(\d+)/;
   warn "Error Number: ".$1." Number of images read: ".0+$obj_temp;
  2. or download this
    Use of uninitialized value $1 in concatenation (.) or string at ...
Argument "Error Number:  Number of images read: 0" isn't numeric in ad
+dition (+) at 1 at ...
Warning: something's wrong at ...