``` Error: Property delegate must have a 'getValue...

# gradle

[sdeleuze]

Error: Property delegate must have a 'getValue(Nothing?, KProperty<*>)' method. None of the following functions is suitable: 
public operator fun <T> ExtraPropertiesExtension.getValue(nothing: Nothing?, property: KProperty<*>): String? defined in org.gradle.script.lang.kotlin (/Users/seb/.gradle/caches/3.4-rc-2/gradle-script-kotlin/5tvl98rl9ivkke67lkfgp33rt/build.gradle.kts (8:34))
Error: Type inference failed. Expected type mismatch: inferred type is String? but String was expected (/Users/seb/.gradle/caches/3.4-rc-2/gradle-script-kotlin/5tvl98rl9ivkke67lkfgp33rt/build.gradle.kts (8:34))
Error: org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: null
Cause: java.lang.NullPointerException
File being compiled and position: (21,9) in /Users/seb/.gradle/caches/3.4-rc-2/gradle-script-kotlin/5tvl98rl9ivkke67lkfgp33rt/build.gradle.kts
PsiElement: classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
        classpath("org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion")
        classpath("org.jetbrains.kotlin:kotlin-noarg:$kotlinVersion")
        classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlinVersion")
        classpath("com.moowork.gradle:gradle-node-plugin:1.1.1")
The root cause was thrown at: StackValue.java:703
        at org.jetbrains.kotlin.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:312)
        at org.jetbrains.kotlin.codegen.ExpressionCodegen.genStatement(ExpressionCodegen.java:356)
        at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:322)
        at org.jetbrains.kotlin.codegen.ExpressionCodegen.returnExpression(ExpressionCodegen.java:2263)