reference #value error

[DrXerox]

I am using =COUNTIF(('[01.xls]Managers Page 1'!$D$19:$D$49),901), which looks
at 12 different workbooks that represent 12 months, and looking for a
specific code (the "901"), and trying to count the number of times it is used.

The problem is unless I have all the workbooks open, I get a #value error.
Am I using the wrong formula or is there something else I need to do?

[jobdillon]

COUNTIF will not work across workbooks unless they are all open. Look at the SUMPRODUCT formula.

[Pepe Le Mokko]

@jobdillon

Fyi this thread is 10 years old... I doubt the OP is still waiting for an answer