Getting a Kotlin type error when building for Android

[cmclaverty-ccea]

What are you trying to do?

I have a project that suddenly started throwing the following error when building for android.

e: .../app/node_modules/react-native-video/android/src/main/java/com/brentvatne/common/api/SideLoadedTextTrackList.kt:21:46 Initializer type mismatch: expected 'ReadableMap', actual 'ReadableMap?'.
e: .../app/node_modules/react-native-video/android/src/main/java/com/brentvatne/common/api/SideLoadedTextTrackList.kt:21:46 Type mismatch: inferred type is 'ReadableMap?', but 'ReadableMap' was expected.

I've not changed anything in the project since I was last able to do a release build and this seems to have come from nowhere.
I'm assuming maybe something on my machine has updated in the background but nothing comes to mind.

I'm using react-native-video@6.0.0. Downgrading isn't compartible with some of my other dependencies and upgrading returns the same or more type errors.

Has anyone came across anything similar? And help would would be approiciated

What have you tried?

I've done ./gradlew clean and re-installed the node_modules folder a number of times.

Buildscript settings are as follows:

buildToolsVersion = "36.0.0"
minSdkVersion = 24
compileSdkVersion = 36
targetSdkVersion = 36
ndkVersion = "25.1.8937393"
kotlinVersion = "1.8.0"

Relevant code

e: .../app/node_modules/react-native-video/android/src/main/java/com/brentvatne/common/api/SideLoadedTextTrackList.kt:21:46 Initializer type mismatch: expected 'ReadableMap', actual 'ReadableMap?'.
e: .../app/node_modules/react-native-video/android/src/main/java/com/brentvatne/common/api/SideLoadedTextTrackList.kt:21:46 Type mismatch: inferred type is 'ReadableMap?', but 'ReadableMap' was expected.

Version

v6

Platforms

Android

[TWG-AI]

This ReadableMap nullability mismatch in SideLoadedTextTrackList.kt suggests a Kotlin version compatibility issue — a Kotlin update may have made this parameter nullable by inference when it wasn't before.

Please share:

1. Your exact react-native-video version
2. Your React Native version
3. Kotlin version (./gradlew --version)
4. Whether this appeared suddenly after a yarn upgrade or package change

As a quick workaround, try pinning kotlinVersion in your android/build.gradle to the version that was working before the breakage.