SELECT Invent.codigo, Productos.descrip, SUM(Invent.saldoenivel);
 FROM  sabia!invent INNER JOIN sabia!productos ;
   ON  Invent.codigo = Productos.codigo;
 WHERE SUM(Invent.saldoenivel) = 0;
 GROUP BY Invent.codigo;
 ORDER BY Invent.codigo

When I try to run a view based on this SQL I get a message "File 'sum.prg' does not exist"

Thank you in advance for your time