The formula you typed contains an error. For information about fixing common formula problems, click Help. To get assistance ...

The formula you typed contains an error.

• For information about fixing common formula problems, click Help.
• To get assistance in entering a function, click Function Wizard (Formulas tab, Function Library group).
• If you are not trying to enter a formula, avoid using an equal sign (=) or minus sign (-), or precede it with a single quotation mark (').