Extension of type 'PitestPluginExtension' does not exist.

[ellisonchan]

I was trying to integrate this plugin to OKHttp project.

But when I tried to add configuration like below.

configure<PitestPluginExtension> {
  junit5PluginVersion.set("1.0.0")
  avoidCallsTo.set(setOf("kotlin.jvm.internal"))
  mutators.set(setOf("STRONGER"))
  targetClasses.set(setOf("org.rogervinas.*"))
  targetTests.set(setOf("org.rogervinas.*"))
  threads.set(Runtime.getRuntime().availableProcessors())
  outputFormats.set(setOf("XML", "HTML"))
  mutationThreshold.set(75)
  coverageThreshold.set(60)
}

It failed and output like
Extension of type 'PitestPluginExtension' does not exist. Currently registered extension types: [ExtraPropertiesExtension, LibrariesForLibs, VersionCatalogsExtension, RootProjectAccessor, BasePluginExtension, DefaultArtifactPublicationSet, SpotlessExtension]