0x80131509SystemMedium

Error 0x80131509 — Exception (.NET COR_E_EXCEPTION) | Windows System Error Fix

Windows 11Windows 10Windows 8.1

What Does 0x80131509 Mean?

An unhandled exception occurred in a .NET Framework application.

Real-World Causes

1.NET application bug causing an unhandled exception
2Corrupted .NET Framework installation
3Incompatible .NET application running on wrong framework version
4Missing .NET dependencies

Symptoms

⚠.NET application crashes with unhandled exception dialog
⚠Application shows 'has stopped working' error
⚠Event Viewer shows .NET Runtime error
⚠Application log shows System.Exception

DIY Fix

Beginner-friendly steps you can try at home

1Update the application to the latest version
2Repair .NET Framework using the .NET Repair Tool
3Reinstall the application
4Install the .NET Framework version required by the application

Advanced Fix

For experienced users and IT professionals

1Check Event Viewer > Application for the full exception stack trace
2Repair .NET: 'DISM /Online /Cleanup-Image /RestoreHealth'
3Reinstall .NET Framework from Windows Features

Frequently Asked Questions

What is .NET Framework?

.NET Framework is a Microsoft software platform that many Windows applications are built on. It provides libraries and runtime services. If .NET is corrupted or the wrong version is installed, applications built on it will crash.

Related Error Codes

0x80131534File Not Found (.NET COR_E_FILENOTFOUND)0x80131500System Exception (.NET COR_E_SYSTEM)

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.