has a different value=(_My New Package_) declared in main manifest at AndroidManifest.xml:2:5-50
    Suggestion: remove the overlay declaration at AndroidManifest.xml       and place it in the build.gradle:
            flavorName {
                    applicationId = "_My old Package_"
To Fix it i found another Android Manifest files, they Were on C:\Users\myusername\Desktop\MyFlutterProjects\Myappname\android\app\src\profile

C:\Users\myusername\Desktop\MyFlutterProjects\Myappname\android\app\src\debug
you have to change the package on this two other manifest files
          
Hi All,
I had the same issue, and I changed in 5 location.
1.)   src/profile/AndroidManifest.xml

2.)   src/debug/AndroidManifest.xml

3.)   src/main/AdroidManifest.xml

4.)   build.gradle .

defaultConfig {

applicationId

5.) MainActivity.java on   "package"
After modifying the above files.  I could run the app without any issues.
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There are three Manifest files, try to search them and change your package name.

In these directories:

app/src/debug

app/src/profile

app/src/main
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Build file 'F:\Flutter\Projects\Alola\android\app\build.gradle' line: 24
* What went wrong:
A problem occurred evaluating project ':app'.
> ASCII
This issue only on windows platform. Doesn't happen if you use ubuntu.
Solution from
https://stackoverflow.com/a/58655615/5180337
flutter/flutter#38163 (comment)
other links tha you should check
firebase/flutterfire#272
flutter/flutter#38163 (comment)
firebase/flutterfire#347
flutter/flutter#35976 (comment)