Kotlinx.coroutines: AbstractCoroutineContextKey Error

[shantanu10]

I am simply using a function in the following form:
fun someMethod() = runBlocking { ..... // some code launch { callSomeMethod() } ..... // some code }

Package Info:

• kotlinVersion = '1.3.61'
• org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.5'

I am getting following error:

kotlin/coroutines/AbstractCoroutineContextKey java.lang.NoClassDefFoundError: kotlin/coroutines/AbstractCoroutineContextKey at java.base/java.lang.ClassLoader.defineClass1(Native Method) at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151) at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:821) at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:719) at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:642) at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:600) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at kotlinx.coroutines.CoroutineDispatcher.<clinit>(CoroutineDispatcher.kt) at kotlinx.coroutines.EventLoopKt.createEventLoop(EventLoop.kt:26) at kotlinx.coroutines.ThreadLocalEventLoop.getEventLoop$kotlinx_coroutines_core(EventLoop.common.kt:126) at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:43) at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source) at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:36) at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source) ......... ......... Caused by: java.lang.ClassNotFoundException: kotlin.coroutines.AbstractCoroutineContextKey

[qwwdfsad]

kotlinx-coroutines-core 1.3.5 is, unfortunately, compatible only with Kotlin 1.3.70+

[shantanu10]

Thanks, worked.

[romrell4]

I'm having this same issue, but using Kotlin 1.4.0 and coroutines 1.3.9... Any ideas?

[elizarov]

Please, check the versions of the dependencies you use with gradlew dependencies and make sure you indeed use Kotlin 1.4.0 and coroutines 1.3.9.