IntelliJ Gradle Project Problems

Hey,

Problems with my Gradle Project after importing it to IntelliJ (as Gradle Project).

build.gradle:

plugins {
id ‘war’
id ‘org.gretty’ version ‘2.2.0’
}
repositories {
jcenter()
}
dependencies {
providedCompile ‘javax.servlet:javax.servlet-api:3.1.0’
testCompile group: ‘junit’, name: ‘junit’, version: ‘4.12’
compile group: ‘com.google.code.gson’, name: ‘gson’, version: ‘2.8.5’
}

The Gradle/Jetty task to be performed is appRun.

Can anybody help?

Best regards,
tobias