Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\wamp\www\consoli\relatorios\ContaReceberRelatorioPDF.php on line 567

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\wamp\www\consoli\relatorios\ContaReceberRelatorioPDF.php on line 569
FPDF error: Some data has already been output, can't send PDF file