App stop working, FLAG_IMMUTABLE

MIT App Inventor Help
1

I made an app to get date from a google sheet & sent text messages. It was working fine but now when I try to use it I get this error.
Can anybody point me in the right direction to fix this.

Runtime Error

appinventor.ai_******************: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.

2

if you search FLAG_IMMUTABLE in the forum, you will find your answer.

3

You are using some extension that is not compatible with android 12.