I am working with this formula and it works great.

=SUMPRODUCT(--('Enroll I'!A$2:$A$2921=$B17),--('Enroll
I'!$O$2:$O$2921="NSITE0"),--('Enroll I'!M$2:$M$2921="Yes"),--('Enroll
I'!N$2:$N$2921="Yes"))

When I add an additional parameter in --('Enroll I'!P$2:$P$2921="Regular")

To look like this....

=SUMPRODUCT(--('Enroll I'!A$2:$A$2921=$B17),--('Enroll
I'!$O$2:$O$2921="NSITE0"),--('Enroll I'!M$2:$M$2921="Yes"),--('Enroll
I'!N$2:$N$2921="Yes")),--('Enroll I'!P$2:$P$2921="Regular"))

I get the infamous, "#N/A" error. The page I am referencing, 'Enroll I",
gets the value from another sheet. It seems to be in the right format -I
have tried, General or Text. I have also tried w and w/o the array symbols.

Ideas?