Please help with error zero

sweetie51106 

Quicker more accurate answers come when you provide an Excel file that demonstrates the problem.  Attach a file in this forum by clicking the "browse" link near the bottom of a reply window.

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Wild guesses....

Perhaps the data type (not cell format) in column H is text, even if it might look numeric.  Looks can be deceiving, and the format of the cell does not matter.  Use formulas of the form =ISTEXT(H1) to determine the data type.

Also, perhaps none of the data column C matches text in the form of "10/2022" or the numeric date Oct 1, 2022.  And I suspect you meant to match any dates in Oct 2022, not specifically Oct 1, 2022.

So, your use of AVERAGEIF might need tweaking.

To that end, be sure to describe in English what range of values in column C you intend to match.

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PS.... Oh, you did.  You wrote:  ``I am trying to average the numbers of a certain month``.

So, perhaps the following will work for you:

=AVERAGEIFS(H:H, C:C, ">=" & DATE(2022,10,1), C:C, "<" & DATE(2022,11,1))

Aside....  But whole column references like C:C and H:H might be inefficient.  It would be better to choose a reasonable limit that allows for any future increase of data.  For example, H1:H1000 and C1:C1000.   And perhaps one or both should be absolute references of the form $H$1:$H$1000 and $C$1:$C$1000.