Ray

That usually means that you haven't included all the inputs to the function
as arguments. Maybe this post will help

http://www.dicks-blog.com/excel/2004...le_functi.html

--
Dick Kusleika
MVP - Excel
Excel Blog - Daily Dose of Excel
www.dicks-blog.com

"Ray Lau" wrote in message
...
Dear all,

When I use automatic / manual calculation, I found that some cell does not
calculate.
The function in the cell is written by me (VBA function), is my program
problem??

Ray