Android 12 requires that you explicitly specify an explicit value for android:exported when the corresponding component has an intent filter defined. To fix the issue, you need to set the android:exported attribute to "false" for all activities in your manifest file.
Here's an example of how to set the android:exported attribute to "false" for an activity:
<activity android:name=".ui.GroupSearchActivity" android:exported="false"></activity>
Once you have set the android:exported attribute to "false" for all activities in your manifest file, the error should disappear.
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