That is a link to your personal App Inventor - we cannot access it.

See my website for a list of possible causes of your issue:
https://www.professorcad.co.uk/appinventortips#TipsApk

The .aia file you posted had no CloudDB component in it, but tried to use CloudDB blocks.
How did you do that?
some blocks 1053×362 44.3 KB Designer 783×270 41.5 KB

Thanks for getting back to us. There are two ways to get a disconnect between the Designer and the Blocks:

  • Insert Blocks via the Backpack from elsewhere
  • Use 'UnDo' in the Blocks work Area
  • i am making cloud chat app but from that original app i am making another one similar app as ur solution ,but problem was in original cloud chat app whatevere text i do same i can see in new one similar app ,so i dont want those previous msgs ..so what i think if i used another one cloude db component replace of previous on cloud db in similar app? or any other option for this?