Is this when attempting to add a second sheet using the same format as the first sheet? Do you have the desired sheet format saved at Tools > Options > System Options > File Locations > Sheet Formats?
This may not be the best method, but it's what I do for quick Sheet duplication, including Sheet Format.
I click (select) a sheet, in your case Sheet1. I hold CTRL and click and drag and drop that icon into the field. Doing so should alter the cursor to a copy icon. Once you drop it, it should prompt as to where you want that sheet placed, such as after current sheet, or at end of sheets. This will copy the entire sheet, including all items within it. Assuming that you need different views and annotations in the subsequent sheet, then just delete its View contents and place new views as needed. The Sheet Format will carry through, and yet can be edited independently as well if needed.