Attempt to invoke virtual method

MIT App Inventor Help
1

Attempt to invoke virtual method 'android.view.View android.widget.TableRow.getChildAt(int)' on a null object reference

Screenshot_20210121-174756
Screenshot_20210121-1747561080×2400 224 KB

2

Thanks for the report. It sounds like you are using a TableArrangement and something about how your components are placed within it is causing an issue. Will you please post the AIA here so we can analyze it to better understand what might be causing the issue?

2 Likes
3

here is the project, thankscard.aia (161.1 KB)

4

The problem is in your screen Tabella Mese where you are setting the Tableviews extension, on Initialise.

You MUST SET the Tableview Datastring BEFORE you build the TableView

This is why you get the error.

Here are suggested corrected blocks:
image

(@ewpatton no Table Arrangements in the project :wink: )