Count the number of instances where multiple criteria match

I am having a similar problem to others in the subforum. I am trying to count the number of instances where TRUE shows up in the 'Buy' column (AF in the formula) and there is a corresponding number on the same line in the 'Shipped 2010' (AP) column.
I have tried =SUMPRODUCT(--(AF4:AF4270="TRUE"),(AP4:AP270>0)) and =SUMPRODUCT(--(AF4:AF4270="TRUE")*(AP4:AP270>0)) but getting the #value sign. I am not sure what I am doing wrong. HELP!

Buy Shipped 2010
FALSE 1
FALSE -
FALSE -
FALSE 12
TRUE 6