Gradle no longer building after Intellij upgrade: java.lang.NoClassDefFoundError: org/jetbrains/plugins/gradle/tooling/ModelBuilderService$Ex

Question

I upgraded to Intellij 2020.3 and now I get this error when I try to load gradle changes. I tried deleting .gradle, didn't help. Any ideas?

FAILURE: Build failed with an exception.

* Where:
Initialization script '/private/var/folders/yg/g0_pq3851612k6x0ckqlv7dc0000gq/T/ijinit.gradle' line: 41

* What went wrong:
A problem occurred evaluating initialization script.
> org/jetbrains/plugins/gradle/tooling/ModelBuilderService$Ex

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.GradleScriptException: A problem occurred evaluating initialization script.
    at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:93)
    at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.lambda$apply$0(DefaultScriptPluginFactory.java:133)
    at org.gradle.configuration.DefaultScriptTarget.addConfiguration(DefaultScriptTarget.java:74)
    at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:136)
    at org.gradle.configuration.BuildOperationScriptPlugin$1.run(BuildOperationScriptPlugin.java:65)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71)
    at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71)
    at org.gradle.configuration.BuildOperationScriptPlugin.lambda$apply$0(BuildOperationScriptPlugin.java:62)
    at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.apply(DefaultUserCodeApplicationContext.java:43)
    at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:62)
    at org.gradle.configuration.DefaultInitScriptProcessor.process(DefaultInitScriptProcessor.java:50)
    at org.gradle.initialization.InitScriptHandler$1.run(InitScriptHandler.java:56)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71)
    at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71)
    at org.gradle.initialization.InitScriptHandler.executeScripts(InitScriptHandler.java:51)
    at org.gradle.initialization.DefaultSettingsPreparer.prepareSettings(DefaultSettingsPreparer.java:33)
    at org.gradle.initialization.BuildOperationFiringSettingsPreparer$LoadBuild.doLoadBuild(BuildOperationFiringSettingsPreparer.java:59)
    at org.gradle.initialization.BuildOperationFiringSettingsPreparer$LoadBuild.run(BuildOperationFiringSettingsPreparer.java:54)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71)
    at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71)
    at org.gradle.initialization.BuildOperationFiringSettingsPreparer.prepareSettings(BuildOperationFiringSettingsPreparer.java:42)
    at org.gradle.initialization.DefaultGradleLauncher.prepareSettings(DefaultGradleLauncher.java:220)
    at org.gradle.initialization.DefaultGradleLauncher.doClassicBuildStages(DefaultGradleLauncher.java:161)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
    at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:126)
    at org.gradle.internal.invocation.GradleBuildController$1.create(GradleBuildController.java:72)
    at org.gradle.internal.invocation.GradleBuildController$1.create(GradleBuildController.java:67)
    at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:178)
    at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:67)
    at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:56)
    at org.gradle.tooling.internal.provider.runner.ClientProvidedPhasedActionRunner.run(ClientProvidedPhasedActionRunner.java:60)
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
    at org.gradle.launcher.exec.BuildOutcomeReportingBuildActionRunner.run(BuildOutcomeReportingBuildActionRunner.java:63)
    at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)
    at org.gradle.tooling.internal.provider.FileSystemWatchingBuildActionRunner.run(FileSystemWatchingBuildActionRunner.java:67)
    at org.gradle.launcher.exec.BuildCompletionNotifyingBuildActionRunner.run(BuildCompletionNotifyingBuildActionRunner.java:41)
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(RunAsBuildOperationBuildActionRunner.java:49)
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(RunAsBuildOperationBuildActionRunner.java:44)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:62)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$call$2(DefaultBuildOperationExecutor.java:76)
    at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:76)
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:44)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.lambda$execute$0(InProcessBuildActionExecuter.java:54)
    at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:87)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:53)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:29)
    at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.lambda$execute$0(BuildTreeScopeLifecycleBuildActionExecuter.java:33)
    at org.gradle.internal.buildtree.BuildTreeState.run(BuildTreeState.java:49)
    at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.execute(BuildTreeScopeLifecycleBuildActionExecuter.java:32)
    at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.execute(BuildTreeScopeLifecycleBuildActionExecuter.java:27)
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:104)
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:55)
    at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.execute(SubscribableBuildActionExecuter.java:64)
    at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.execute(SubscribableBuildActionExecuter.java:37)
    at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildActionExecuter.lambda$execute$0(SessionScopeLifecycleBuildActionExecuter.java:54)
    at org.gradle.internal.session.BuildSessionState.run(BuildSessionState.java:67)
    at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildActionExecuter.execute(SessionScopeLifecycleBuildActionExecuter.java:50)
    at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildActionExecuter.execute(SessionScopeLifecycleBuildActionExecuter.java:36)
    at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36)
    at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25)
    at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:59)
    at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:31)
    at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:55)
    at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:41)
    at org.gradle.tooling.internal.provide

Answer 1

I upgraded to 2020.3.1, which I could NOT do using "Check for updates". Rather, I had to download Jetbrains Toolbox and get the newer version there. This resulted in my having two version of IntelliJ, and had to select 2020.3.1 from the Toolbox.

（Source: https://youtrack.jetbrains.com/issue/KTIJ-866)