Your formula is incomplete. You must include an operand following each operator. For example, =A1+A2+ is missing an operand ...

Your formula is incomplete. You must include an operand following each operator. For example, =A1+A2+ is missing an operand following the second plus sign. Try one of the following:  • Add the missing operand to the formula, or delete the extra operator. • 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 (').