Have you tried with Gradle 4.x ? If not - plz do and report. Also plz attach project archive to be able to reproduce the issue.

@eshepelyuk I didn't try with Gradle 4.X. My project was a minimal example, I can't unfortunately publish it. But I just applied the plugin as shown in your documentation and followed your conventions, nothing fancy. Did you find the issue?

Hello

1. plz try in 4.x
2. just obfuscate the code and send me a minimal project reproducing the bug, the project must contain gradle wrapper as well. Unfortunately this is a single way to debug the issues. Otherwise I won't be able to help.

@eshepelyuk

Made a little investigation. Configuration like this breaks gatlingRun.

Removing scalaVersion from configuration and cleaning project makes it run again.

It seems that scalaVersion works wrong way. Tested on Gradle 5.3 and 4.10

plugins {
    id "com.github.lkishalmi.gatling" version "3.2.9"
}

repositories {
    mavenCentral()
}

group 'test'
version '0.0.1'

apply plugin: 'scala'

dependencies {
    compile 'org.scala-lang:scala-library:2.13.1'
}

gatling {
    toolVersion = '3.2.1'
    scalaVersion = '2.13.1'
    includeMainOutput = false
    includeTestOutput = false
}

I will reopen this issue because I've found a cause.