For quite some time now we are struggling to update our Andr Gradle Community #community-support

For quite some time now we are struggling to updat...

Christos Paleopanos

05/19/2026, 6:15 PM

For quite some time now we are struggling to update our Android project to Gradle 9.x.x because on IDE sync we are faced with this failure (complete stacktrace on 🧵 ) :

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* What went wrong:
Invalid version string: unspecified
> Invalid version string: unspecified

From the stacktrace I can tell that it has nothing to do with our project. The references are only on IntellijIDEA's model actions (

GradleModelFetchAction

) & Gradle server. How do I even start debugging this? Where & what do I look for in the Android project that might be causing this? I'm asking because many other pet-projects which are using Gradle 9.x.x never failed with this error.

Christos Paleopanos

05/19/2026, 6:16 PM

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* Exception is:
org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController$BuildActionExecutionException: Invalid version string: unspecified
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController$BuildActionExecutionException.wrap(DefaultBuildTreeLifecycleController.java:150)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.runFromBuildModel(DefaultBuildTreeLifecycleController.java:97)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.lambda$fromBuildModel$2(DefaultBuildTreeLifecycleController.java:88)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.lambda$runBuild$5(DefaultBuildTreeLifecycleController.java:121)
	at org.gradle.internal.model.StateTransitionController.lambda$transition$7(StateTransitionController.java:207)
	at org.gradle.internal.model.StateTransitionController.doTransition(StateTransitionController.java:304)
	at org.gradle.internal.model.StateTransitionController.lambda$transition$8(StateTransitionController.java:207)
	at org.gradle.internal.work.DefaultSynchronizer.withLock(DefaultSynchronizer.java:45)
	at org.gradle.internal.model.StateTransitionController.transition(StateTransitionController.java:207)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.runBuild(DefaultBuildTreeLifecycleController.java:118)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.fromBuildModel(DefaultBuildTreeLifecycleController.java:81)
	at org.gradle.tooling.internal.provider.runner.AbstractClientProvidedBuildActionRunner.runClientAction(AbstractClientProvidedBuildActionRunner.java:42)
	at org.gradle.tooling.internal.provider.runner.ClientProvidedPhasedActionRunner.run(ClientProvidedPhasedActionRunner.java:58)
	at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
	at org.gradle.internal.buildtree.ProblemReportingBuildActionRunner.run(ProblemReportingBuildActionRunner.java:54)
	at org.gradle.launcher.exec.BuildOutcomeReportingBuildActionRunner.run(BuildOutcomeReportingBuildActionRunner.java:83)
	at org.gradle.tooling.internal.provider.FileSystemWatchingBuildActionRunner.run(FileSystemWatchingBuildActionRunner.java:135)
	at org.gradle.launcher.exec.BuildCompletionNotifyingBuildActionRunner.run(BuildCompletionNotifyingBuildActionRunner.java:65)
	at org.gradle.launcher.exec.RootBuildLifecycleBuildActionExecutor.lambda$execute$0(RootBuildLifecycleBuildActionExecutor.java:101)
	at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:126)
	at org.gradle.launcher.exec.RootBuildLifecycleBuildActionExecutor.execute(RootBuildLifecycleBuildActionExecutor.java:101)
	at org.gradle.launcher.exec.BuildTreeLifecycleBuildActionExecutor.runRootBuildAction(BuildTreeLifecycleBuildActionExecutor.java:104)
	at org.gradle.launcher.exec.BuildTreeLifecycleBuildActionExecutor.execute(BuildTreeLifecycleBuildActionExecutor.java:74)
	at org.gradle.launcher.exec.RunAsBuildOperationBuildActionExecutor$2.call(RunAsBuildOperationBuildActionExecutor.java:65)
	at org.gradle.launcher.exec.RunAsBuildOperationBuildActionExecutor$2.call(RunAsBuildOperationBuildActionExecutor.java:61)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:210)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:205)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:67)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:167)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:60)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:54)
	at org.gradle.launcher.exec.RunAsBuildOperationBuildActionExecutor.execute(RunAsBuildOperationBuildActionExecutor.java:61)
	at org.gradle.launcher.exec.RunAsWorkerThreadBuildActionExecutor.lambda$execute$0(RunAsWorkerThreadBuildActionExecutor.java:36)
	at org.gradle.internal.work.DefaultWorkerLeaseService.lambda$runAndReleaseLocks$0(DefaultWorkerLeaseService.java:300)
	at org.gradle.internal.work.ResourceLockStatistics$1.measure(ResourceLockStatistics.java:43)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAndReleaseLocks(DefaultWorkerLeaseService.java:298)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocksAcquired(DefaultWorkerLeaseService.java:294)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:286)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:130)
	at org.gradle.launcher.exec.RunAsWorkerThreadBuildActionExecutor.execute(RunAsWorkerThreadBuildActionExecutor.java:36)
	at org.gradle.tooling.internal.provider.continuous.ContinuousBuildActionExecutor.execute(ContinuousBuildActionExecutor.java:110)
	at org.gradle.tooling.internal.provider.SubscribableBuildActionExecutor.execute(SubscribableBuildActionExecutor.java:64)
	at org.gradle.internal.session.DefaultBuildSessionContext.execute(DefaultBuildSessionContext.java:46)
	at org.gradle.internal.buildprocess.execution.BuildSessionLifecycleBuildActionExecutor$ActionImpl.apply(BuildSessionLifecycleBuildActionExecutor.java:106)
	at org.gradle.internal.buildprocess.execution.BuildSessionLifecycleBuildActionExecutor$ActionImpl.apply(BuildSessionLifecycleBuildActionExecutor.java:94)
	at org.gradle.internal.session.BuildSessionState.run(BuildSessionState.java:73)
	at org.gradle.internal.buildprocess.execution.BuildSessionLifecycleBuildActionExecutor.execute(BuildSessionLifecycleBuildActionExecutor.java:67)
	at org.gradle.internal.buildprocess.execution.BuildSessionLifecycleBuildActionExecutor.execute(BuildSessionLifecycleBuildActionExecutor.java:45)
	at org.gradle.internal.buildprocess.execution.StartParamsValidatingActionExecutor.execute(StartParamsValidatingActionExecutor.java:57)
	at org.gradle.internal.buildprocess.execution.StartParamsValidatingActionExecutor.execute(StartParamsValidatingActionExecutor.java:32)
	at org.gradle.internal.buildprocess.execution.SessionFailureReportingActionExecutor.execute(SessionFailureReportingActionExecutor.java:51)
	at org.gradle.internal.buildprocess.execution.SessionFailureReportingActionExecutor.execute(SessionFailureReportingActionExecutor.java:39)
	at org.gradle.internal.buildprocess.execution.SetupLoggingActionExecutor.execute(SetupLoggingActionExecutor.java:47)
	at org.gradle.internal.buildprocess.execution.SetupLoggingActionExecutor.execute(SetupLoggingActionExecutor.java:31)
	at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:70)
	at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:37)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:39)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:29)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:35)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.ForwardClientInput.lambda$execute$0(ForwardClientInput.java:40)
	at org.gradle.internal.daemon.clientinput.ClientInputForwarder.forwardInput(ClientInputForwarder.java:80)
	at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:37)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:64)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:63)
	at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:37)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:84)
	at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:37)
	at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104)
	at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:52)
	at org.gradle.launcher.daemon.server.DaemonStateCoordinator.lambda$runCommand$0(DaemonStateCoordinator.java:321)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:47)

Continues on the next message...

Christos Paleopanos

05/19/2026, 6:16 PM

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Caused by: com.intellij.openapi.externalSystem.model.ExternalSystemException: Invalid version string: unspecified
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.executeAction(GradleModelFetchAction.java:234)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.lambda$doExecute$5(GradleModelFetchAction.java:125)
	at com.intellij.gradle.toolingExtension.impl.telemetry.GradleOpenTelemetry.lambda$runWithSpan$1(GradleOpenTelemetry.java:37)
	at com.intellij.gradle.toolingExtension.impl.telemetry.GradleOpenTelemetry.callWithSpan(GradleOpenTelemetry.java:55)
	at com.intellij.gradle.toolingExtension.impl.telemetry.GradleOpenTelemetry.callWithSpan(GradleOpenTelemetry.java:31)
	at com.intellij.gradle.toolingExtension.impl.telemetry.GradleOpenTelemetry.runWithSpan(GradleOpenTelemetry.java:36)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.doExecute(GradleModelFetchAction.java:124)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.lambda$execute$1(GradleModelFetchAction.java:103)
	at com.intellij.gradle.toolingExtension.impl.telemetry.GradleOpenTelemetry.callWithSpan(GradleOpenTelemetry.java:55)
	at com.intellij.gradle.toolingExtension.impl.telemetry.GradleOpenTelemetry.callWithSpan(GradleOpenTelemetry.java:31)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.lambda$execute$2(GradleModelFetchAction.java:102)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.withOpenTelemetry(GradleModelFetchAction.java:291)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.lambda$execute$3(GradleModelFetchAction.java:101)
	at com.intellij.gradle.toolingExtension.impl.util.GradleExecutorServiceUtil.withSingleThreadExecutor(GradleExecutorServiceUtil.java:18)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.execute(GradleModelFetchAction.java:100)
	at com.intellij.gradle.toolingExtension.impl.modelAction.GradleModelFetchAction.execute(GradleModelFetchAction.java:34)
	at org.gradle.tooling.internal.consumer.connection.InternalBuildActionAdapter.execute(InternalBuildActionAdapter.java:65)
	at org.gradle.tooling.internal.provider.runner.AbstractClientProvidedBuildActionRunner$ActionAdapter.executeAction(AbstractClientProvidedBuildActionRunner.java:108)
	at org.gradle.tooling.internal.provider.runner.AbstractClientProvidedBuildActionRunner$ActionAdapter.runAction(AbstractClientProvidedBuildActionRunner.java:96)
	at org.gradle.tooling.internal.provider.runner.AbstractClientProvidedBuildActionRunner$ActionAdapter.fromBuildModel(AbstractClientProvidedBuildActionRunner.java:85)
	at org.gradle.tooling.internal.provider.runner.AbstractClientProvidedBuildActionRunner$ActionAdapter.fromBuildModel(AbstractClientProvidedBuildActionRunner.java:68)
	at org.gradle.internal.buildtree.DefaultBuildTreeModelCreator.fromBuildModel(DefaultBuildTreeModelCreator.java:67)
	at org.gradle.internal.cc.impl.barrier.BarrierAwareBuildTreeModelCreator.fromBuildModel$lambda$0(BarrierAwareBuildTreeModelCreator.kt:36)
	at org.gradle.internal.cc.impl.barrier.VintageConfigurationTimeActionRunner.runConfigurationTimeAction(VintageConfigurationTimeActionRunner.kt:48)
	at org.gradle.internal.cc.impl.barrier.BarrierAwareBuildTreeModelCreator.fromBuildModel(BarrierAwareBuildTreeModelCreator.kt:35)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.lambda$runFromBuildModel$3(DefaultBuildTreeLifecycleController.java:95)
	at org.gradle.internal.Try.ofFailable(Try.java:46)
	at org.gradle.internal.buildtree.DefaultBuildTreeLifecycleController.runFromBuildModel(DefaultBuildTreeLifecycleController.java:95)
	... 78 more

tony

05/19/2026, 6:18 PM

(the stacktrace would be easier to read if you added it as a text snippet) does your project build from CLI? Is this only an IDE issue? If the latter, which version of Android Studio are you using? Which version of AGP? Which specific version of Gradle?

Christos Paleopanos

05/19/2026, 6:26 PM

1. Project builds from CLI 2. Only an IDE issue (Android Studio Panda 4 2025.3.4 Patch 1, also on IntellijIDEA 2026.1.2) 3. AGP version 9.0.0 (also tried with 9.2.0) 4. Gradle version 9.5.1 (started seeing this error since 9.0.0)

tony

05/19/2026, 6:38 PM

I don't recognize that error and don't have any insights, unfortunately. Have you tried attaching a debugger?

Christos Paleopanos

05/19/2026, 6:41 PM

no, never done that. any resources you can share on how I can attach a debugger?

tony

05/19/2026, 6:45 PM

I think you would first want to open a project (one that syncs) and add a dependency on the Tooling API. See here. Then you can add breakpoints in the places that look interesting. Hm, I know how to debug a CLI build but I'm not sure how to tell an IDE sync invocation to attach to a remote debugger. For CLI, you'd pass

-Dorg.gradle.debug=true

. Maybe there's a way to configure IDE sync to do that, or maybe there's a way to pretend you're an IDE sync from the command line

tony

05/19/2026, 6:47 PM

in the IDE with the TAPI dependency, create a run configuration with the

Remote JVM Debug

template

Christos Paleopanos

05/19/2026, 7:00 PM

thanks

Vampire

05/19/2026, 8:08 PM

There is no real way to fake an IDE sync. But you could just add the debug setting in the Gradle properties file, that should then also work on sync. But start with looking at the daemon log in the Gradle user home, maybe there the real stack trace is found?

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