Can't figure out how to get rid of N/As in IF function with VLOOKUP.

I hate to ask for help when there is so much available through searching, but I've spent all day looking through other threads, and I'm just not
making it click.

Here is the formula I have:

=IF(ISERROR(VLOOKUP(A12,AC!$A:$B,2,FALSE)=TRUE),VLOOKUP(A12,DC!$A:$B,2,FALSE),VLOOKUP(A12,AC!$A:$B,2,FALSE))

I have three sheets. On sheet one, I have the formula above. The formula pulls data from sheets two and three, labelled AC and DC respectively.

The problem is that depending on the day, there might not be any data on sheets two, three, or both - and it produces an N/A error.

Any way I can add to the above formula so if I get an N/A it shows a blank cell instead?

Thanks so much in advance!

You have a misplaced )

=IF(ISERROR(VLOOKUP(A12,AC!$A:$B,2,FALSE)=TRUE),VLOOKUP(A12,DC!$A:$B,2,FALSE),VLOOKUP(A12,AC!$A:$B,2,FALSE))
That is testing if the VLOOKUP is TRUE....Not the ISERROR..
Should be
=IF(ISERROR(VLOOKUP(A12,AC!$A:$B,2,FALSE))=TRUE,VLOOKUP(A12,DC!$A:$B,2,FALSE),VLOOKUP(A12,AC!$A:$B,2,FALSE))

Also (although this is not actually 'wrong'), you don't need the =TRUE part.
The IF needs a True or False result
ISERROR already returns a True or False result.

So
=IF(ISERROR(VLOOKUP(A12,AC!$A:$B,2,FALSE)),VLOOKUP(A12,DC!$A:$B,2,FALSE),VLOOKUP(A12,AC!$A:$B,2,FALSE))

Thanks for the replies everyone - extremely helpful!