-pod2usage(' ERROR! Input file with a sequence should be provided with -sequence/-in') unless $infile;
-pod2usage(' ERROR! Unknown database at ' . $db_path . '. Use -dbpath and -dbname for configuring the database' ) unless exists $database->{$db_entry};
-pod2usage(' ERROR! UNIREF database doesn\'t exist. Use -dbpath and -dbname for configuring the database') unless -f $database->{$db_entry}{database};
+my $dp = $database->{$db_entry}{database};
+pod2usage("ERROR! Input file with a sequence should be provided with -sequence/-in") unless $infile;
+pod2usage("ERROR! Unknown database at $db_path. Use -dbpath and -dbname for configuring the database" ) unless exists $database->{$db_entry};
+pod2usage("ERROR! UNIREF database is not available at $dp. Use -dbpath and -dbname for configuring the database") unless -f $dp;