Sometimes Sumproduct just gets me!

This is what I have: The 1st array works as does the 2nd array, as in
this case it returns 1, which is correct. But, when I then want to sum
all the time in column O that corresponds to the 2 correct arrays I get
a #Value.

So far I have tried 3-4 variations and cannot get it to work properly.

=SUMPRODUCT(('[Activity
Detail.htm]Detail'!$D$8:$D$65000=$C14)*('[Activity
Detail.htm]Detail'!$K$8:$K$65000=D$2)*('[Activity
Detail.htm]Detail'!$O$8:$O$65000))

Thanks,


Hans