This is related to #98136

Possible workaround: https://stackoverflow.com/questions/49886597/multidex-issue-with-flutter/60158352

But I suggest Flutter handles multidex by itself when an existing project is migrated to a newer version.

@songyang-dev just delete the FlutterMultiDexApplication file ,it works for me.

Deleting the FlutterMultiDexApplication file works for now

Thanks for the report @songyang-dev
I tried to do the same by going back to 3.16.0 to 3.22.0, but was unable to replicate the reported error.
I tried with flutter run and flutter run --multidex both.
Can you provide exact steps to replicate or a pattern or a config that is needed to replicate this in latest stable ?
Also, if you switch back to 3.19, can you check if the same error occurs or not ?
You can also provide relevant file details that are required to properly replicate the issue.

Deleting the FlutterMultiDexApplication file works for now

Manually deleting worked for me too, but in my opinion this has to work out of the box after upgrading to Flutter 3.22.

I forgot to specify that the existing project needs to be using multidex support. When you run it on the older version of Flutter, it should say in the console that multidex support is being used.

Oh and sorry about the version number. The old version is 3.19.

Thanks for the update. I will try to setup and replicate this by going back to previous stable versions and have multidex support. I tried with an existing project by running it in 3.19 and upon upgrading it worked fine, but need to see the multidex support for that project, but it'll take a bit time to properly replicate this.

Meantime, I'll keep the issue open and label based on the reported behavior, for team's attention.

In my side, flutter build appbundle was working fine, then upgrade to 3.22 and same error.

I had to update my android/app/build.gradle like the doc specifies

android {
    defaultConfig {
        multiDexEnabled true
    }
}

dependencies {
    implementation "androidx.multidex:multidex:2.0.1"
}

Now everything went back to normal.
In my side, flutter build appbundle was working fine, then upgrade to 3.22 and same error.

I had to update my android/app/build.gradle like the doc specifies

android {
    defaultConfig {
        multiDexEnabled true
    }
}

dependencies {
    implementation "androidx.multidex:multidex:2.0.1"
}

Now everything went back to normal.

The doc mentions

Therefore, if your minSdkVersion is 21 or higher, multidex is enabled by default and you don't need the multidex library.

Maybe it works for project that hardcode minSdkVersion, however I'm using minSdkVersion flutter.minSdkVersion

EDIT:

Look at #148368 (comment) before doing this.

Maybe it works for project that hardcode minSdkVersion, however I'm using minSdkVersion flutter.minSdkVersion

In my project "minSdkVersion 23" is hardcoded in android/app/build.gradle but I still had the problem.

Hmm yes, it looks like this was an oversight in https://github.com/flutter/flutter/pull/142267/files - there was logic to create a FlutterMultiDexApplication.java file when multidex was enabled. Multidex is enabled by default, now, for all android versions that flutter supports, and so that logic was removed.

But the removal of the logic to create the file doesn't remove the file itself, and that file itself relies on imports that were also removed in that PR, it seems. The correct solution here is to delete the file.