Spock TestEngine with ID 'spock' failed to discover tests

Question

When I was running unit test with spcok,An exception appears：

Internal Error occurred.
org.junit.platform.commons.JUnitException: TestEngine with ID 'spock' failed to discover tests
    at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:160)
    at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverSafely(EngineDiscoveryOrchestrator.java:134)
    at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:108)
    at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:80)
    at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:110)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
    at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
    at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:53)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: java.lang.StackOverflowError
    at org.codehaus.groovy.runtime.InvokerHelper.invokePojoMethod(InvokerHelper.java:1016)
    at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:1008)
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.compareToWithEqualityCheck(DefaultTypeTransformation.java:593)
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.compareEqual(DefaultTypeTransformation.java:617)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.compareEqual(ScriptBytecodeAdapter.java:708)
    at groovy.runtime.metaclass.java.lang.StringMetaClass.invokeMethod(StringMetaClass.groovy:32)
    at org.codehaus.groovy.runtime.InvokerHelper.invokePojoMethod(InvokerHelper.java:1017)
    at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:1008)
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.compareToWithEqualityCheck(DefaultTypeTransformation.java:593)
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.compareEqual(DefaultTypeTransformation.java:617)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.compareEqual(ScriptBytecodeAdapter.java:708)
    at groovy.runtime.metaclass.java.lang.StringMetaClass.invokeMethod(StringMetaClass.groovy:32)

maven version

spock-core:2.1-groovy-3.0
spock-reports:2.1.1-groovy-3.0
groovy : 3.0.9
groovy-json : 3.0.10
groovy-xml : 3.0.10
junit:4.12