What is this error mean?

Unresolved reference: implementation

My build.gradle.kts file https://pastebin.com/EAcCPBff

Perhaps you are using old Gradle.

@Robert Jaros I'm using intellij idea, how can i update gradle?

Usually gradle is included in the project as a wrapper. Check

gradle/wrapper

directory in your project and

gradle-wrapper.properties

file.

I tried, but i got error.

Script compilation error:

  Line 19:              implementation("com.soywiz.korlibs.korau:korau:2.2.0")
             ^ Unresolved reference: implementation

I don't believe that

buildscript

dependencies have

implementation

as a configuration. Try

classpath

instead of

implementation

.

Now this error

Unresolved reference: classpath