Recently, I encountered a weird issue with coroutines in Kotlin. A library that references a coroutine version that differed from my Kotlin’s coroutine could not compile. It resulted in the following error being displayed.
Cannot access 'kotlinx.coroutines.CoroutineScope' which is a supertype of '.....'.
This is probably related to an Application Binary Interface (ABI) issue where a low-level C compiled code has some non-breaking changes but as the ABI has changed, a recompilation is required. In this case, I could either recompile Kotlin coroutines + referenced library, or I could just state the same exact coroutine version used by the referenced library.
In my Gradle build (build.gradle) file, I added this new line:
compile group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: coroutinesVersion
And in my Gradle properties (gradle.properties) file, I specified my the variable:
coroutinesVersion=1.3.2
If you’re using Maven, then you can change your configuration like this:
<properties>
<coroutines.version>1.3.2</kotlin.version>
</properties>
...
<dependency>
<groupId>org.jetbrains.kotlinx</groupId>
<artifactId>kotlinx-coroutines-core</artifactId>
<version>${coroutines.version}</version>
</dependency>
The fix is absurdly easy despite of the weird and cryptic error message. I hope this was helpful to you and helped you understood what might have happened to cause this issue to occur.
