Gatling Engine problems after updating fram 2.0.0 SNAPSHOT to 2.0.0-RC4

Gatling (Open-Source)
1

This is my Engine-class:

object Engine extends App {
val props = new GatlingPropertiesBuilder
props.disableCompiler()
props.dataDirectory(IDEPathHelper.dataDirectory.toString)
props.resultsDirectory(IDEPathHelper.resultsDirectory.toString)
props.requestBodiesDirectory(IDEPathHelper.requestBodiesDirectory.toString)
props.binariesDirectory(IDEPathHelper.mavenBinariesDirectory.toString)
Gatling.fromMap(props.build)
}

After updating to Version 2.0.0-RC4, I get all kinds of scala errors like:

scala: not found: type GatlingPropertiesBuilder
val props = new GatlingPropertiesBuilder
^

Any ideas?

Thanx!