The report is still no working, even though I did as below
{@error1} in ["","0"] and
{@error2} in ["","0"] and
{@error3} in ["","0"] and
{@error4} in ["","0"]
HOWEVER, if I changed the formula order, for example,
{@error3} in ["","0"] and
{@error2} in ["","0"] and
{@error1} in...