It is in Formula Auditing on the Formulas tab.
There is no formula error button in Excel. However, there is an Error Checking button on the Formulas ribbon in the Formula Auditing section in Excel 2007.
In Excel 2007, on the Formulas ribbon, select the Error Checking option in the Formula Auditing section.
An error message begins with the pound sign (#).
#DIV/0! Microsoft Excel displays the #DIV/0! error when a number is divided either by zero (0) or by a cell that contains no value.
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The #REF! error.
It is a set of related commands that you can have together on the ribbon in Excel.
ribbon
Most Excel 2007 commands are on the menu ribbon; far too many to list here. See related links for how the Excel 2007 ribbon compares to Excel 2003 commands.The ribbon at the top of Excel 2007 and higher is a list of menu options.
The Excel spelling feature that begins spell checking is the "Spelling" command, which can be accessed through the "Review" tab on the Ribbon. You can also initiate spell checking by pressing the F7 key. This feature scans the worksheet for misspelled words and offers suggestions for corrections.
The dialog box that specifies a cell containing an error and the type of error, such as "Divide by Zero Error," is typically the "Error Checking" dialog box in spreadsheet applications like Microsoft Excel. When Excel detects an error in a formula, it highlights the cell and may display a small warning icon. Clicking on this icon brings up the Error Checking dialog, which provides details about the error and potential solutions.
In Excel Where are the various function categories stored on the Ribbon?