Kotlin DSL syntax error for build.gradle.kts

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Using the currently stable versions (IntelliJ IDEA 2017.3.4, Gradle 4.5.1 and Kotlin 1.2.21) on Windows 10, I was able to resolve it by following these steps:

  • Exit IDEA.
  • If needed, update the Gradle wrapper. Repeat the following command until Gradle says it is up to date: ./gradlew wrapper
  • Delete folder .gradle
  • Start IDEA.

It still worked after I restarted IDEA.

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