Lost Connection to devic, and Project Crash in DebugMode #8626
Description
Please file this bug report at https://github.com/flutter/flutter-intellij/issues/new.
What happened
When i start the Project in Debug-Mode, this message appears and the Project crashed after a view seconds with: Lost connection to device.
Version information
IntelliJ IDEA 2025.2.5 • Flutter plugin io.flutter 88.1.0 • Dart plugin 500.0.0
Error getting Flutter sdk information.
Exception
null
java.lang.Throwable: Error listening to ToolEvent stream: org.dartlang.vm.service.element.RPCError@7a6787c6
at com.intellij.openapi.diagnostic.Logger.error(Logger.java:375)
at io.flutter.vmService.VmServiceWrapper$2.onError(VmServiceWrapper.java:228)
at org.dartlang.vm.service.VmServiceBase.processResponse(VmServiceBase.java:659)
at org.dartlang.vm.service.VmServiceBase.processMessage(VmServiceBase.java:434)
at org.dartlang.vm.service.VmServiceBase$1.onMessage(VmServiceBase.java:88)
at de.roderick.weberknecht.WebSocketReceiver.run(WebSocketReceiver.java:65)
Flutter log
2025-12-01 10:52:08 io.flutter.FlutterInitializer [INFORMATION] Executing Flutter plugin startup for project: Backend
2025-12-01 10:53:54 io.flutter.FlutterInitializer [INFORMATION] Executing Flutter plugin startup for project: projectname
2025-12-01 10:53:54 io.flutter.FlutterInitializer [INFORMATION] Flutter module has been found for project: projectname
2025-12-01 10:53:54 io.flutter.jxbrowser.JxBrowserManager [INFORMATION] projectname: Installing JxBrowser
2025-12-01 10:53:54 io.flutter.jxbrowser.JxBrowserManager [INFORMATION] projectname: JxBrowser platform files already exist, skipping download
2025-12-01 10:53:54 io.flutter.jxbrowser.JxBrowserManager [INFORMATION] Loaded JxBrowser files successfully
2025-12-01 10:53:54 io.flutter.sdk.FlutterCommand [INFORMATION] flutter.bat [--no-color, config, --machine]
2025-12-01 10:53:54 io.flutter.sdk.FlutterCommand [INFORMATION] flutter.bat [--no-color, config, --machine]
2025-12-01 10:53:54 io.flutter.run.daemon.DeviceDaemon [INFORMATION] starting Flutter device daemon #1: C:/Users/username/dev/flutter/bin/flutter.bat daemon
2025-12-01 10:53:57 io.flutter.sdk.FlutterSdk [INFORMATION] flutter config --machine (2889ms)
2025-12-01 10:53:58 io.flutter.run.daemon.DeviceDaemon [INFORMATION] flutter device daemon #1: Device daemon started.
2025-12-01 10:53:58 io.flutter.sdk.FlutterSdk [INFORMATION] flutter config --machine (3773ms)
2025-12-01 12:36:05 io.flutter.run.daemon.DevToolsServerTask [INFORMATION] Finding or starting DevTools
2025-12-01 12:36:05 io.flutter.run.daemon.FlutterApp [INFORMATION] DebugApp projectname (Debug)
2025-12-01 12:36:05 io.flutter.run.daemon.FlutterApp [INFORMATION] C:\Users\username\dev\flutter\bin\flutter.bat [--no-color, run, --machine, --track-widget-creation, --device-id=windows, --start-paused, --no-dds, --dart-define=flutter.inspector.structuredErrors=true, --devtools-server-address=http://127.0.0.1:9100, lib\main.dart]
2025-12-01 12:36:41 io.flutter.run.daemon.FlutterAppDaemonEventListener [SCHWERWIEGEND] Exception while sending DTD request
java.util.concurrent.ExecutionException: java.lang.Exception: Timed out waiting for DTD websocket to start
at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073)
at io.flutter.run.daemon.FlutterAppDaemonEventListener.sendDtdRequest(FlutterApp.java:846)
at io.flutter.run.daemon.FlutterAppDaemonEventListener.onAppDebugPort(FlutterApp.java:768)
at io.flutter.run.daemon.DaemonEvent$AppDebugPort.accept(DaemonEvent.java:214)
at io.flutter.run.daemon.DaemonEvent.dispatch(DaemonEvent.java:49)
at io.flutter.run.daemon.DaemonApi.dispatch(DaemonApi.java:181)
at io.flutter.run.daemon.DaemonApi$1.onTextAvailable(DaemonApi.java:152)
at com.intellij.execution.process.ProcessHandler$2.onTextAvailable(ProcessHandler.java:292)
at com.intellij.execution.process.ProcessHandler.notifyTextAvailable(ProcessHandler.java:223)
at com.intellij.execution.process.ColoredProcessHandler.coloredTextAvailable(ColoredProcessHandler.java:68)
at io.flutter.utils.MostlySilentColoredProcessHandler.coloredTextAvailable(MostlySilentColoredProcessHandler.java:75)
at com.intellij.execution.process.AnsiEscapeDecoder.processTextChunk(AnsiEscapeDecoder.java:106)
at com.intellij.execution.process.AnsiEscapeDecoder.escapeText(AnsiEscapeDecoder.java:69)
at com.intellij.execution.process.ColoredProcessHandler.notifyTextAvailable(ColoredProcessHandler.java:57)
at com.intellij.execution.process.BaseOSProcessHandler$SimpleOutputReader.onTextAvailable(BaseOSProcessHandler.java:133)
at com.intellij.util.io.BaseOutputReader.sendText(BaseOutputReader.java:220)
at com.intellij.util.io.BaseOutputReader.processInput(BaseOutputReader.java:204)
at com.intellij.util.io.BaseOutputReader.readAvailableBlocking(BaseOutputReader.java:151)
at com.intellij.util.io.BaseDataReader.readAvailable(BaseDataReader.java:72)
at com.intellij.util.io.BaseDataReader.doRun(BaseDataReader.java:153)
at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:249)
at com.intellij.util.io.BaseDataReader.lambda$start$0(BaseDataReader.java:48)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:173)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:167)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:735)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:732)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:732)
at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.Exception: Timed out waiting for DTD websocket to start
at io.flutter.dart.DtdUtils.lambda$readyDtdService$1(DtdUtils.java:39)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at com.intellij.util.concurrency.ContextCallable.lambda$call$1(ContextCallable.java:86)
at com.intellij.util.concurrency.ContextCallable.call(ContextCallable.java:95)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at com.intellij.util.concurrency.SchedulingWrapper$MyScheduledFutureTask.run(SchedulingWrapper.java:277)
... 7 more
2025-12-01 12:36:41 io.flutter.run.daemon.FlutterAppDaemonEventListener [SCHWERWIEGEND] IntelliJ IDEA 2025.2.5 Build #IU-252.28238.7
2025-12-01 12:36:41 io.flutter.run.daemon.FlutterAppDaemonEventListener [SCHWERWIEGEND] JDK: 21.0.9; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o.
2025-12-01 12:36:41 io.flutter.run.daemon.FlutterAppDaemonEventListener [SCHWERWIEGEND] OS: Windows 11
2025-12-01 12:36:41 io.flutter.run.daemon.FlutterAppDaemonEventListener [SCHWERWIEGEND] Plugin to blame: Flutter version: 88.1.0
2025-12-01 12:36:41 io.flutter.run.daemon.FlutterAppDaemonEventListener [SCHWERWIEGEND] Last Action: Debug
2025-12-01 12:36:41 io.flutter.vmService.VmServiceWrapper [SCHWERWIEGEND] Error listening to ToolEvent stream: org.dartlang.vm.service.element.RPCError@7a6787c6
java.lang.Throwable: Error listening to ToolEvent stream: org.dartlang.vm.service.element.RPCError@7a6787c6
at com.intellij.openapi.diagnostic.Logger.error(Logger.java:375)
at io.flutter.vmService.VmServiceWrapper$2.onError(VmServiceWrapper.java:228)
at org.dartlang.vm.service.VmServiceBase.processResponse(VmServiceBase.java:659)
at org.dartlang.vm.service.VmServiceBase.processMessage(VmServiceBase.java:434)
at org.dartlang.vm.service.VmServiceBase$1.onMessage(VmServiceBase.java:88)
at de.roderick.weberknecht.WebSocketReceiver.run(WebSocketReceiver.java:65)
2025-12-01 12:36:41 io.flutter.vmService.VmServiceWrapper [SCHWERWIEGEND] IntelliJ IDEA 2025.2.5 Build #IU-252.28238.7
2025-12-01 12:36:41 io.flutter.vmService.VmServiceWrapper [SCHWERWIEGEND] JDK: 21.0.9; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o.
2025-12-01 12:36:41 io.flutter.vmService.VmServiceWrapper [SCHWERWIEGEND] OS: Windows 11
2025-12-01 12:36:41 io.flutter.vmService.VmServiceWrapper [SCHWERWIEGEND] Plugin to blame: Flutter version: 88.1.0
2025-12-01 12:36:41 io.flutter.vmService.VmServiceWrapper [SCHWERWIEGEND] Last Action: Debug