Version 'Suspend' raises illegal reflective access / AWT-EventQueue-0" kotlin.NotImplementedError

[GunnarBernsteinHH]

90 [AWT-EventQueue-0] INFO Contributors - Clearing result
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by retrofit2.Platform (file:/C:/Users/Gunnar/.gradle/caches/modules-2/files-2.1/com.squareup.retrofit2/retrofit/2.9.0/d8fdfbd5da952141a665a403348b74538efc05ff/retrofit-2.9.0.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of retrofit2.Platform
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Exception in thread "AWT-EventQueue-0" kotlin.NotImplementedError: An operation is not implemented.
at tasks.Request4SuspendKt.loadContributorsSuspend(Request4Suspend.kt:6)
at contributors.Contributors$loadContributors$3.invokeSuspend(Contributors.kt:77)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

started with:
"C:\Program Files\OpenJDK11\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition Eval\lib\idea_rt.jar=64163:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition Eval\bin" -Dfile.encoding=UTF-8 -classpath "C:\Development\Travelling Salesman\GitHub\KotlinIntroCoroutines\build\classes\kotlin\main;C:\Development\Travelling Salesman\GitHub\KotlinIntroCoroutines\build\resources\main;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-reflect\1.5.20\63810951f09a27f7827977f1bc21094042a915e\kotlin-reflect-1.5.20.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\com.jakewharton.retrofit\retrofit2-kotlinx-serialization-converter\0.8.0\4fe25acf1b2f12f17d7187f7cfcf4ee730822d50\retrofit2-kotlinx-serialization-converter-0.8.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\com.squareup.retrofit2\retrofit-mock\2.9.0\da17c2bcd6a771694ce79091d8394a3118bd7890\retrofit-mock-2.9.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\com.squareup.retrofit2\adapter-rxjava2\2.9.0\180ad7353dbf0480cabc215948b5a234e3692f0a\adapter-rxjava2-2.9.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\com.squareup.retrofit2\retrofit\2.9.0\d8fdfbd5da952141a665a403348b74538efc05ff\retrofit-2.9.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\com.squareup.okhttp3\okhttp\4.9.1\51215279c3fe472c59b6b7dd7491e6ac2e28a81b\okhttp-4.9.1.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-swing\1.5.1\3a6498130368bbd3a5cdbb15264e64cedac80eb5\kotlinx-coroutines-swing-1.5.1.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-jdk8\1.5.1\6a30b64389d2f541d27c7756d414412eb52a15d\kotlinx-coroutines-jdk8-1.5.1.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-slf4j\1.5.1\df3c9da192aa8c14da5f1b81e0c39e8fb646cc10\kotlinx-coroutines-slf4j-1.5.1.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib\1.5.20\9de35cc611bcecec8edce1d56d8e659953806751\kotlin-stdlib-1.5.20.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-debug\1.5.1\f0e934de961d0d36f3fb9c61114ddf8803abbcde\kotlinx-coroutines-debug-1.5.1.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-classic\1.2.3\7c4f3c474fb2c041d8028740440937705ebb473a\logback-classic-1.2.3.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\io.reactivex.rxjava2\rxkotlin\2.4.0\2f4a35d683b4851a036b8828d4a7c6888adf75c7\rxkotlin-2.4.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\io.reactivex.rxjava2\rxjava\2.2.21\6f13f24c44567fc660aab94d639cda9f0fe95628\rxjava-2.2.21.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-serialization-core-jvm\1.2.2\f1facb8403cacd65ee314f91fec216ba229f9ac2\kotlinx-serialization-core-jvm-1.2.2.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.reactivestreams\reactive-streams\1.0.3\d9fb7a7926ffa635b3dcaa5049fb2bfa25b3e7d0\reactive-streams-1.0.3.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\com.squareup.okio\okio\2.8.0\49b64e09d81c0cc84b267edd0c2fd7df5a64c78c\okio-jvm-2.8.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-serialization-json-jvm\1.2.2\7cd520a077c5d1addfa8f80f39cd14cb2de027d7\kotlinx-serialization-json-jvm-1.2.2.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-jdk8\1.5.20\636c5653641cd956de9aee5792155b07ea49825e\kotlin-stdlib-jdk8-1.5.20.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.slf4j\slf4j-api\1.7.25\da76ca59f6a57ee3102f8f9bd9cee742973efa8a\slf4j-api-1.7.25.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-core-jvm\1.5.1\59d09c330d2977b39e1e4c0e3711fc903e1b46b0\kotlinx-coroutines-core-jvm-1.5.1.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains\annotations\13.0\919f0dfe192fb4e063e7dacadee7f8bb9a2672a9\annotations-13.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-common\1.5.20\3d79dbd48bf605f4aac1e7028981a1953e245cbb\kotlin-stdlib-common-1.5.20.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-core\1.2.3\864344400c3d4d92dfeb0a305dc87d953677c03c\logback-core-1.2.3.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-jdk7\1.5.20\218b60e1d446d1e0a18bc7aa8663634b136fbcc5\kotlin-stdlib-jdk7-1.5.20.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\net.java.dev.jna\jna-platform\5.5.0\af38e7c4d0fc73c23ecd785443705bfdee5b90bf\jna-platform-5.5.0.jar;C:\Users\Gunnar.gradle\caches\modules-2\files-2.1\net.java.dev.jna\jna\5.5.0\e0845217c4907822403912ad6828d8e0b256208\jna-5.5.0.jar" contributors.MainKt