Getting Error: Unresolved reference: S, FLAG_MUTABLE

[marcchiu]

My project needs to use an external USB microphone and the internal one at the same time on an Android device, so I tried adding this library to my existing project but when it failed to build. So I created a new flutter project, leaving all codes intact (except setting the sdk versions as below) and added this package as the first thing and I'm getting the very same error:

e: /Users/myname/.pub-cache/hosted/pub.dartlang.org/quick_usb-0.4.0/android/src/main/kotlin/com/example/quick_usb/QuickUsbPlugin.kt: (20, 52): Unresolved reference: S
e: /Users/myname/.pub-cache/hosted/pub.dartlang.org/quick_usb-0.4.0/android/src/main/kotlin/com/example/quick_usb/QuickUsbPlugin.kt: (21, 19): Unresolved reference: FLAG_MUTABLE

I have already set the sdk versions to:

compileSdkVersion 33
minSdkVersion 23
targetSdkVersion 33

flutter clean and pub get, invalidate caches and restarting Android Studio did not help.

My Flutter SDK version is 3.3.2

Please help.

[upendra-bajpai]

+1
got same error

[febryanaep]

i tried changed on build.gradle:
ext.kotlin_version = '1.6.10'
classpath 'com.android.tools.build:gradle:4.1.3'
compileSdkVersion 32

it's worked!

[tegarnugroho]

is there a solution? @marcchiu @upendra-bajpai