Table sorting

Hi, I stuck with table sorting
I did the same as in the documentation (https://support.sisense.com/kb/en/article/blox-sort-values-action), but nothing works, it shows me that metadata.panels[1] is empty and that's why the sorting doesn't work.
Screenshots of what I'm doing - attached

The reason my code doesn't work is probably because the items in panels[1] are empty