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Can't launch Arma3
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Description

I installed Arma3 on a new PC (used to play in a different PC years ago)

I got this error:

Arma 3 Launcher Exception Log

Arma 3 Launcher has encountered an unexpected error described below.
Sorry for the inconvenience.
Please report this on Arma 3 Feedback Tracker (http://feedback.arma3.com). Thanks to you we may fix the issue faster!


System information

Date: 2025-07-05 18:01:29 / 2025-07-05 23:31:29 +05
Current dir: C:\Program Files (x86)\Steam\steamapps\common\Arma 3
AppData dir: C:\Users\jvbha\AppData\Local
Command line: "C:\Program Files (x86)\Steam\steamapps\common\Arma 3\arma3launcher.exe"
Version: 1.5.152.984
CLR version: 4.0.30319.42000
OS Version: 10.0.26100.0 (Microsoft Windows NT 10.0.26100.0)
OS 64 bit: True
Process 64 bit: False
Personal dir: C:\Users\jvbha\OneDrive\Documents
Culture: en-US
UI Culture: en-US
Point of log: Unhandled Exception


Exception

System.Windows.Markup.XamlParseException: Internal XAML system error: Missing case 'TemplateStarting' in DeferringWriter'WriteEndMember' method. ---> System.Xaml.XamlInternalException: Internal XAML system error: Missing case 'TemplateStarting' in DeferringWriter'WriteEndMember' method.

at System.Xaml.DeferringWriter.WriteEndMember()
at System.Xaml.XamlObjectWriter.WriteEndMember()
at System.Xaml.XamlWriter.WriteNode(XamlReader reader)
at System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
--- End of inner exception stack trace ---
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
at Launcher.App.InitializeComponent()
at Launcher.Program.StartGui(InitArgs param)
at Launcher.Program.HandleCommandLine()
at Launcher.Program.RunLauncher()
at Launcher.Program.Main(String[] args)

Modules and assemblies

  • mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll
  • arma3launcher, Version=1.5.152.984, Culture=neutral, PublicKeyToken=null; C:\Program Files (x86)\Steam\steamapps\common\Arma 3\arma3launcher.exe
  • log4net, Version=1.2.13.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a; C:\Program Files (x86)\Steam\steamapps\common\Arma 3\Launcher\log4net.dll
  • System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll
  • System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll
  • System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll
  • System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll
  • SharedResources, Version=1.5.152.984, Culture=neutral, PublicKeyToken=null; C:\Program Files (x86)\Steam\steamapps\common\Arma 3\Launcher\SharedResources.dll
  • PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.dll
  • WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\WindowsBase\v4.0_4.0.0.0__31bf3856ad364e35\WindowsBase.dll
  • PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; C:\WINDOWS\Microsoft.Net\assembly\GAC_32\PresentationCore\v4.0_4.0.0.0__31bf3856ad364e35\PresentationCore.dll
  • System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xaml\v4.0_4.0.0.0__b77a5c561934e089\System.Xaml.dll
  • Utils, Version=1.5.152.984, Culture=neutral, PublicKeyToken=null; C:\Program Files (x86)\Steam\steamapps\common\Arma 3\Launcher\Utils.dll
  • UIAutomationTypes, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll
  • UIAutomationProvider, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\UIAutomationProvider\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationProvider.dll
  • arma3launcher.resources, Version=1.5.152.984, Culture=en-US, PublicKeyToken=null; C:\Program Files (x86)\Steam\steamapps\common\Arma 3\Launcher\en-US\arma3launcher.resources.dll
  • SharedResources.resources, Version=1.5.152.984, Culture=en-US, PublicKeyToken=null; C:\Program Files (x86)\Steam\steamapps\common\Arma 3\Launcher\en-US\SharedResources.resources.dll

Assembly resolution

Details

Severity
Block
Resolution
Open
Reproducibility
Always
Operating System
Windows 11 x64
Operating System Version
24H2
Category
Game Startup
Steps To Reproduce

Launch the game in steam

Additional Information

If I launch the game using arma_x86.exe from the game folder directly, it works without any issues

Event Timeline

ibae1 created this task.Sat, Jul 5, 8:06 PM