error when expanding column in power query

[RE]

I am trying to expand a column in the power query and once I select the items I want to expand it says error in the cells. Any thoughts on why this is happpening.

[MarcelBeug]

Without further information, it can be anything.

It may well be that the errors already exist in the nested tables, i.e. before expanding.

If you click in a cell in the empty space right from Error, the error message will be displayed at the bottom of the screen.