Hi @jessicatorode88 ,

The problem is here:

  The input for the Extension option is incorrect.

It should be E or Extension, but not "Extension of 100".

Look at my screenshot:

How do you select this option? From the context menu or from the Dynamic prompt?

Can you describe your steps in more details ?

You can try also to type E and hit Return when AutoCAD asks for the option, then type 100 and hit return again. This should set the extension to 100 units.