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.
It displays #DIV/0! when you try to divide a number by zero. That is because it is mathematically impossible to divide something by zero, so Excel gives you that error code to indicate that it is what you tried to do.
In Excel Where are the various function categories stored on the Ribbon?
You have tabs on the ribbon and groups within the tabs.