Click the cell that displays the error, click the button that appears 
, and then click Trace Error if it appears.
Review the possible causes and solutions.
Possible causes and solutions
Using an unacceptable argument in a function that requires a numeric argument
Make sure the arguments used in the function are numbers. For example, even if the value you want to enter is $1,000, enter 1000 in the formula.
Using a worksheet function that iterates, such as IRR or RATE, and the function cannot find a result
Use a different starting value for the worksheet function.
Change the number of times Microsoft Excel iterates formulas.
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On the Tools menu, click Options, and then click the Calculation tab.
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Select the Iteration check box.
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To set the maximum number of times Microsoft Excel will recalculate, type the number of iterations in the Maximum iterations box. The higher the number of iterations, the more time Excel needs to calculate a worksheet.
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To set the maximum amount of change you will accept between calculation results, type the amount in the Maximum change box. The smaller the number, the more accurate the result and the more time Excel needs to calculate a worksheet.
Change the formula so that its result is between 
and 
.