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kotlinlang

I am running the latest version of intellij and building a kotlin backend app. I am using java 21, and when writing a kotlint wrapper for some Java code I get the following error: Cannot access 'DeferredBehavior' which is a supertype of 'AppointmentState'. Check your module classpath for missing or conflicting dependencies - Can someone advise ? running the gradle build directly works fine, its just the ide.

Use a Gradle run config instead of a Kotlin run config, there must be something weird in your IDEA config