Even check suppress warning, why download component give unwanted toast like package name and class name not found?
Plwase provide a screenshot of that nessage
It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.
To get an image of your blocks, right click in the Blocks Editor and select “Download Blocks as Image”. You might want to use an image editor to crop etc. if required. Then post it here in the community.
This error occured due to other extension.