Microsoft-Windows-AppHost

Description

The App Host failed to launch because a problem occurred while loading the app files and settings. Ensure that the app is properly installed or try reinstalling the app.

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The App Host failed to launch because a problem occurred while loading the app files and settings. Ensure that the app is properly installed or try reinstalling the app.

Description

The App Host has encountered an unexpected error and will terminate. The error is HResult.

Message #

The App Host has encountered an unexpected error and will terminate. The error is  %1.

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Description

WWAJSE report submitted with parameters 1: <param1> 2: <param2> 3: <param3> 4: <param4> 5: <param5> 6: <param6>. (PID: <PID>. Process Creation Time: <ProcessCreationTime>. App Binary Path: <ApplicationBinaryPath>.) Report Id: <ReportId>.

Message #

WWAJSE report submitted with parameters 1: <%1> 2: <%2> 3: <%3> 4: <%4> 5: <%5> 6: <%6>. (PID: <%7>. Process Creation Time: <%8>. App Binary Path: <%9>.) Report Id: <%10>

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Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-AppHost",
    "guid": "{98E0765D-8C42-44A3-A57B-760D7F93225A}",
    "event_source_name": "",
    "event_id": 112,
    "version": 0,
    "level": 4,
    "task": 8,
    "opcode": 14,
    "keywords": -9223372036854775807,
    "time_created": "2026-05-30T01:59:53.2155499+00:00",
    "event_record_id": 4,
    "correlation": {},
    "execution": {
      "process_id": 8300,
      "thread_id": 704
    },
    "channel": "Microsoft-Windows-AppHost/Admin",
    "computer": "JD-DC01-2022.ludus.domain",
    "security": {
      "user_id": "S-1-5-21-1006758700-2167138679-1475694448-1105"
    }
  },
  "user_data": {
    "WWAJSERacReportEvent": {
      "param1": "Microsoft.Windows.CloudExperienceHost_10.0.20348.1_neutral_neutral_cw5n1h2txyewy",
      "param2": "App",
      "param3": "f675",
      "param4": "FFFFFFFD",
      "param5": "(null)",
      "param6": "0_0",
      "PID": "8300",
      "ProcessCreationTime": "1dcefd80069de95",
      "ApplicationBinaryPath": "C:\\Windows\\system32\\wwahost.exe",
      "ReportId": "5464222b-d126-4816-a885-60fc1cf0bf9e"
    }
  },
  "message": "WWAJSE report submitted with parameters 1: <Microsoft.Windows.CloudExperienceHost_10.0.20348.1_neutral_neutral_cw5n1h2txyewy> 2: <App> 3: <f675> 4: <FFFFFFFD> 5: <(null)> 6: <0_0>. (PID: <8300>. Process Creation Time: <1dcefd80069de95>. App Binary Path: <C:\\Windows\\system32\\wwahost.exe>.) Report Id: <5464222b-d126-4816-a885-60fc1cf0bf9e>"
}

Description

The App Host failed to enumerate WinRT namespaces due to an issue with a winmd file. If you have third party winmd files ensure they are not corrupt and that their filenames match their corresponding namespace names.

Message #

The App Host failed to enumerate WinRT namespaces due to an issue with a winmd file. If you have third party winmd files ensure they are not corrupt and that their filenames match their corresponding namespace names.

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Description

The App Host failed to enumerate WinRT namespaces due to unknown error. (HResultErrorCode).

Message #

The App Host failed to enumerate WinRT namespaces due to unknown error. (%1)

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Description

App <ApplicationName> crashed with an unhandled Javascript exception. App details are as follows: Display Name:<DisplayName>, AppUserModelId: <AppUserModelId> Package Identity:<PackageFullName> PID:<ProcessId>. The details of the JavaScript exception are as follows Exception Name:<ErrorType>, Description:<ErrorDescription>, HTML Document Path:<DocumentFile>, Source File Name:<SourceFile>, Source Line Number:<SourceLine>, Source Column Number:<SourceColumn>, and Stack Trace: StackTrace.

Message #

App <%2> crashed with an unhandled Javascript exception. App details are as follows: Display Name:<%1>, AppUserModelId: <%3> Package Identity:<%4> PID:<%5>. The details of the JavaScript exception are as follows Exception Name:<%6>, Description:<%7>, HTML Document Path:<%8>, Source File Name:<%9>, Source Line Number:<%10>, Source Column Number:<%11>, and Stack Trace: %12.

Fields #

Description

App <WWATerminateApplication.ApplicationName> terminated itself by calling terminateApp API. App details are as follows: Display Name:<WWATerminateApplication.DisplayName>, AppUserModelId: <WWATerminateApplication.AppUserModelId> Package Identity:<WWATerminateApplication.PackageFullName> PID:<WWATerminateApplication.ProcessId>. The API was called from the context of the following HTML document: <WWATerminateApplication.DocumentFile>. Error object passed to terminateApp carried the following details Description:<WWATerminateApplication.ErrorDescription>, and Stack Trace:- WWATerminateApplication.StackTrace.

Message #

App <%2> terminated itself by calling terminateApp API. App details are as follows:  Display Name:<%1>, AppUserModelId: <%3> Package Identity:<%4> PID:<%5>. The API was called from the context of the following HTML document:  <%7>. Error object passed to terminateApp carried the following details Description:<%6>, and Stack Trace:- %8.

Fields #

Example Event #

{
  "system": {
    "provider": "Microsoft-Windows-AppHost",
    "guid": "{98E0765D-8C42-44A3-A57B-760D7F93225A}",
    "event_source_name": "",
    "event_id": 127,
    "version": 0,
    "level": 2,
    "task": 8,
    "opcode": 12,
    "keywords": -9223372036854775807,
    "time_created": "2026-05-30T01:59:53.1373982+00:00",
    "event_record_id": 3,
    "correlation": {},
    "execution": {
      "process_id": 8300,
      "thread_id": 12668
    },
    "channel": "Microsoft-Windows-AppHost/Admin",
    "computer": "JD-DC01-2022.ludus.domain",
    "security": {
      "user_id": "S-1-5-21-1006758700-2167138679-1475694448-1105"
    }
  },
  "user_data": {
    "WWATerminateApplication": {
      "DisplayName": "Microsoft account",
      "ApplicationName": "App",
      "AppUserModelId": "Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy!App",
      "PackageFullName": "Microsoft.Windows.CloudExperienceHost_10.0.20348.1_neutral_neutral_cw5n1h2txyewy",
      "ProcessId": "8300",
      "ErrorDescription": "{\"setPromise\":\"[function]\"}",
      "DocumentFile": "/default.html",
      "StackTrace": "Error: Scenario not set. If you are in debug mode, please launch with a URI.\n   at AppManager.prototype._crashCxh (ms-appx://microsoft.windows.cloudexperiencehost/js/appManager.js:203:13)\n   at AppManager.prototype._setScenario (ms-appx://microsoft.windows.cloudexperiencehost/js/appManager.js:369:17)\n   at AppManager.prototype.initialize (ms-appx://microsoft.windows.cloudexperiencehost/js/appManager.js:75:13)\n   at Anonymous function (ms-appx://microsoft.windows.cloudexperiencehost/js/default.js:46:13)\n   at p (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:37380)\n   at M.enter (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:40967)\n   at _run (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:42792)\n   at _completed (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:42233)\n   at Anonymous function (ms-appx://microsoft.windows.cloudexperiencehost/core/js/require-helpers.js:12:13)\n   at l.execCb (ms-appx://microsoft.windows.cloudexperiencehost/lib/require.js:26:290)\n"
    }
  },
  "message": "App <App> terminated itself by calling terminateApp API. App details are as follows:  Display Name:<Microsoft account>, AppUserModelId: <Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy!App> Package Identity:<Microsoft.Windows.CloudExperienceHost_10.0.20348.1_neutral_neutral_cw5n1h2txyewy> PID:<8300>. The API was called from the context of the following HTML document:  </default.html>. Error object passed to terminateApp carried the following details Description:<{\"setPromise\":\"[function]\"}>, and Stack Trace:- Error: Scenario not set. If you are in debug mode, please launch with a URI.\n   at AppManager.prototype._crashCxh (ms-appx://microsoft.windows.cloudexperiencehost/js/appManager.js:203:13)\n   at AppManager.prototype._setScenario (ms-appx://microsoft.windows.cloudexperiencehost/js/appManager.js:369:17)\n   at AppManager.prototype.initialize (ms-appx://microsoft.windows.cloudexperiencehost/js/appManager.js:75:13)\n   at Anonymous function (ms-appx://microsoft.windows.cloudexperiencehost/js/default.js:46:13)\n   at p (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:37380)\n   at M.enter (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:40967)\n   at _run (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:42792)\n   at _completed (ms-appx://microsoft.windows.cloudexperiencehost/Microsoft.WinJS-reduced/js/base.js:2:42233)\n   at Anonymous function (ms-appx://microsoft.windows.cloudexperiencehost/core/js/require-helpers.js:12:13)\n   at l.execCb (ms-appx://microsoft.windows.cloudexperiencehost/lib/require.js:26:290)\r\n."
}

Description

This app was closed because of a critical infrastructure failure.

Message #

This app was closed because of a critical infrastructure failure.

Fields #

Description

This app was closed because one or more packages were modified. Please reinstall the app.

Message #

This app was closed because one or more packages were modified. Please reinstall the app.

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Description

App <ApplicationName> terminated itself by window.close() API, which is not recommended. App details are as follows: Display Name:<DisplayName>, AppUserModelId: <AppUserModelId> Package Identity:<PackageFullName> PID:<ProcessId>. The API was called from the context of the following HTML document: <DocumentFile>

Message #

App <%2> terminated itself by window.close() API, which is not recommended. App details are as follows:  Display Name:<%1>, AppUserModelId: <%3> Package Identity:<%4> PID:<%5>. The API was called from the context of the following HTML document:  <%6>

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Description

App <ApplicationName> was terminated due to a navigation error with target url <TargetUrl> and error code <ErrorCode>. App details are as follows: Display Name:<DisplayName>, AppUserModelId: <AppUserModelId> Package Identity:<PackageFullName> PID:<ProcessId>. The Navigation was initiated from the context of the following HTML document: <DocumentFile>

Message #

App <%2> was terminated due to a navigation error with target url <%7> and error code <%8>. App details are as follows: Display Name:<%1>, AppUserModelId: <%3> Package Identity:<%4> PID:<%5>. The Navigation was initiated from the context of the following HTML document:  <%6>

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Description

The App Host could not start because the host module Module::Function failed with HResult.

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The App Host could not start because the host module %2::%1 failed with %3.

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Description

The App Host could not start because the web module WebInstance::Module::Function failed with HResult.

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The App Host could not start because the web module %3::%2::%1 failed with %4.

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Description

The App Host could not start because the platform (WebInstance) failed with HResult.

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The App Host could not start because the platform (%1) failed with %2.

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Description

The App Host could not start because WinRT failed to initialize with HResult.

Message #

The App Host could not start because WinRT failed to initialize with %1.

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Description

Pending resume event was signaled to the Host.

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Pending resume event was signaled to the Host.

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Description

The App has subdownloads remaining to complete during suspension. Host has requested the system for more time.

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The App has subdownloads remaining to complete during suspension. Host has requested the system for more time.

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Description

SourceMessageId : Message

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%6%10 : %11

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Description

SourceMessageId : Message

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%6%10 : %11

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Description

SourceMessageId : Message

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%6%10 : %11

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Description

Suspending Deferral Increment.

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Suspending Deferral Increment.

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Description

Suspending Deferral Decrement.

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Suspending Deferral Decrement.

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