Hi,
If you open the Tiller Money Feeds extension there is a Templates item that will read your sheet and display the installed worksheets. Locate the “Insights” and click on the label. The row will expand and show the help, version info and a Restore button. [ I would post a screen shot, but I’m using Xfce session manager and I can’t find the screen shot tool I have mapped to a function key in Gnome session ]
Sometimes it will look like this if you have accidentally overwritten a column header on the Transactions sheet. It doesn’t know what to do if it can’t find the columns named Date, Description, Category, etc.
The idea to restore the Insights sheet from Tiller suggested by @ramerkw is also a good idea as long as you haven’t made any custom changes to the sheet yourself.