Execution failed for task ':flutter_nearby_connections:compileReleaseKotlin'. > Compilation error. See log for more details

[Akshay-akkay]

flutter run gives this

`e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/NearbyService.kt: (97, 9): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/NearbyService.kt: (98, 27): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/NearbyService.kt: (107, 71): Unresolved reference: java
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/NearbyService.kt: (108, 21): Unresolved reference: createNotificationChannel
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (24, 71): Unresolved reference: java
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (30, 13): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (31, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (32, 23): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (33, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (38, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (39, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (44, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (45, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (50, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (51, 21): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (58, 17): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (65, 25): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (66, 25): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (69, 15): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (71, 19): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class
e: /Users/akkay/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_nearby_connections-1.1.1/android/src/main/kotlin/com/nankai/flutter_nearby_connections/ServiceBindManager.kt: (72, 19): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.
The class is loaded from /Users/akkay/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':flutter_nearby_connections:compileDebugKotlin'.

Compilation error. See log for more details

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 20s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)
`

[malloy045]

I solved this by upgrading Kotlin via Android Studio and making sure the new version matched ext.kotlin_version in build.gradle in my flutter project. In my case, I upgraded to 1.4.32: