Here is the solution from Stephen Lebans:

fDesign is a custom function for a RotateText method. At some point you
have either:

1) Imported my function into your MDB, added a custom Menu Item to call
the function, and now you have deleted the  Code module containing the
fDesign function.

2) You have imported the ToolBars from the sample RotateText MDB but not
the code.

If you have not made significant modifications to the native Access
ToolBars then simply:

1. Right-click on the top menu bar and select Customize.

2. On the tab that says "Customize" there is a list of all the menu
bars/toolbars. Check one at a time, and hit the button that says
"Reset."

This will reset all the menu bars/toolbars back to their standard
layout.