Countifs with checkbox, blank date


I am trying to use the countifs to count a reference sheet when a checkbox is checked and a date is blank.

I know the first part is "=COUNTIFS({referenced sheet checkbox}, 1," I'm just not sure what to use for the second portion.

I think the closest is:

=COUNTIFS({reference sheet checkbox}, 1, AND({referenced sheet date}, ISBLANK(@cell)))

The error message with this one is INVALID DATA TYPE.

Any suggestions?

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