This is an array formula, so you need to commit it with CTRL-SHIFT-
ENTER when you type it in or subsequently edit it. You should not type
the curly brackets around the formula yourself.

Another thing is to check that the data has a consistent format.

Hope this helps.

Pete


On Mar 19, 10:54 am, "Sean" wrote:
I received the following formula which counts the number of unique
occurences within my Range "Range1" but I'm getting a #N/A error, yet
when I go into the formula edit, it shows me a result of 16, which is
correct

Why would this be (BTW it has worked correcly for 8 weeks)

{=SUM(IF(FREQUENCY(IF(LEN(Range1)0,MATCH(Range1,R ange1,0),""),IF(LEN(Range*1)0,MATCH(Range1,Range1 ,0),""))0,1))}