I am using IntelliJ IDEA 2021.1 (Community Edition) - Build #IC-211.6693.111, built on April 6, 2021. I created a new kotlin project - project template(JVM): Application, built system: Gradle Kotlin, project JDK:1.8 version 1.8.0_281. In the “scr/main/kotlin” folder, I created a kotlin file with a simple code like "fun main(){println(“Hi!”)}. When I tried to run the file(the build was ok), I got this error: “Could not find or load main class MyAppKt”. What did I do wrong?
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Did you also add your main class to the build.gradle
file?
mainClassName = "projectPackage.MyAppKt"
I assume if you are adding the MyAppKt
file manually it is not added to the build.grale
. But clearly more information about the project would help here. Meanwhile check this post Kotlin - Error: Could not find or load main class _DefaultPackage

ksysha
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