I am attempting to add a formula to a cell when a sheet is added to my
workbook. I get the following error when I run the program
"Application-defined or object-defined error". Here is the line of
code that is throwing up the error.

Range("B20").formula = "=IF('Sign 2'!P650,'Sign 2'!E10,"")"

I believe it has to do with the if in the formula but I am unable find
any thine on the subject.
Other formulas such as the formula below are added with no problems.

Range("L20").formula = "=('Sign 1'!P65+'Sign 1'!P70)/'Sign 1'!E10"

Please help if you can.