Net run time error



Troubleshoot app launch failures

This article describes some common reasons and possible solutions for application launch failures. It relates to framework-dependent applications, which rely on a .NET installation on your machine.

If you already know which .NET version you need, you can download it from .NET downloads.

.NET installation not found

If a .NET installation is not found, the application fails to launch with a message similar to:

The error message includes a link to download .NET. You can follow this link to get to the appropriate download page. You can also pick the .NET version (specified by Host version ) from .NET downloads.

On the download page for the required .NET version, find the .NET Runtime download that matches the architecture listed in the error message. You can then install it by downloading and running an Installer.

.NET is available through various Linux package managers. See Install .NET on Linux for details. Note that preview versions of .NET are typically not available through package managers.

You need to install the .NET Runtime package for the appropriate version, like dotnet-runtime6 .

Alternatively, on the download page for the required .NET version, you can download Binaries for the specified architecture.

Required framework not found

If a required framework or compatible version is not found, the application fails to launch with a message similar to:

The error indicates the name, version, and architecture of the missing framework and the location at which it is expected to be installed. To run the application, you can install a compatible runtime at the specified «.NET location». If the application is targeting a lower version than one you have installed and you would like to run it on a higher version, you can also configure roll-forward behavior for the application.

Install a compatible runtime

The error message includes a link to download the missing framework. You can follow this link to get to the appropriate download page.

Alternately, you can download a runtime from the .NET downloads page. There are multiple .NET runtime downloads.

The following table shows the frameworks that each runtime contains.

Runtime download Included frameworks
ASP.NET Core Runtime Microsoft.NETCore.App
Microsoft.AspNetCore.App
.NET Desktop Runtime Microsoft.NETCore.App
Microsoft.WindowsDesktop.App
.NET Runtime Microsoft.NETCore.App
Runtime download Included frameworks
ASP.NET Core Runtime Microsoft.NETCore.App
Microsoft.AspNetCore.App
.NET Runtime Microsoft.NETCore.App

Select a runtime download containing the missing framework, and install it.

On the download page for the required .NET version, find the runtime download that matches the architecture listed in the error message. You likely want to download an Installer.

.NET is available through various Linux package managers. See Install .NET on Linux for details. Note that preview versions of .NET are typically not available through package managers.

You need to install the .NET runtime package for the appropriate version, like dotnet-runtime6 or dotnet-aspnet6 .

Alternatively, on the download page for the required .NET version, you can download Binaries for the specified architecture.

In most cases, when the application that failed to launch is using such an installation, the «.NET location» in the error message points to:

Other options

There are other installation and workaround options to consider.

Run the dotnet-install script

Download the dotnet-install script for your operating system. Run the script with options based on the information in the error message. The dotnet-install script reference page shows all available options.

Launch PowerShell and run:

For example, the error message in the previous section would correspond to:

If you encounter an error stating that running scripts is disabled, you may need to set the execution policy to allow the script to run:

For more details on installation using the script, see Install with PowerShell automation.

For example, the error message in the previous section would correspond to:

For more details on installation using the script, see Scripted install.

For example, the error message in the previous section would correspond to:

For more details on installation using the script, see Install with bash automation.

Download binaries

You can download a binary archive of .NET from the download page. From the Binaries column of the runtime download, download the binary release matching the required architecture. Extract the downloaded archive to the «.NET location» specified in the error message.

For more details on manual installation, see Install .NET on Windows

For more details on manual installation, see Install .NET on Linux

For more details on manual installation, see Install .NET on macOS

Configure roll-forward behavior

If you already have a higher version of the required framework installed, you can make the application run on that higher version by configuring its roll-forward behavior.

When running the application, you can specify the —roll-forward command line option or set the DOTNET_ROLL_FORWARD environment variable. By default, an application requires a framework that matches the same major version that the application targets, but can use a higher minor or patch version. However, application developers may have specified a different behavior. For more details, see Framework-dependent apps roll-forward.

Since using this option lets the application run on a different framework version than the one for which it was designed, it may result in unintended behavior due to changes between versions of a framework.

Breaking changes

Multi-level lookup disabled for .NET 7 and later

On Windows, before .NET 7, the application could search for frameworks in multiple install locations.

Subdirectories relative to:

  • dotnet executable when running the application through dotnet
  • DOTNET_ROOT environment variable (if set) when running the application through its executable ( apphost )

Globally registered install location (if set) in HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\\InstallLocation .

Default install location of %ProgramFiles%\dotnet (or %ProgramFiles(x86)%\dotnet for 32-bit processes on 64-bit Windows).

This multi-level lookup behavior was enabled by default but could be disabled by setting the environment variable DOTNET_MULTILEVEL_LOOKUP=0 .

For applications targeting .NET 7 and later, multi-level lookup is completely disabled and only one location—the first location where a .NET installation is found—is searched. When running an application through dotnet , frameworks are only searched for in subdirectories relative to dotnet . When running an application through its executable ( apphost ), frameworks are only searched for in the first of the above locations where .NET is found.

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Fix .NET Runtime Error 1026, Exception code c00000fd on Windows 10 systems

While trying to run an application on your computer, you may find it crashing frequently or just refusing to start. It may also display an error message – .NET runtime error 1026 bearing the following description under Event Viewer – The process was terminated due to an unhandled exception, Exception code c00000fd.

Fix .NET Runtime Error 1026

Event 1026 indicates that the problem lies with the application itself and Runtime error 1026 associated with .NET Framework mainly occurs when the framework fails or crashes while running as it was not programmed to handle properly (an “exception”).To fix this, you can follow any of the methods given below!

  1. Disable and re-enable the .NET framework
  2. Re-install Runtime Libraries
  3. Troubleshoot in a Clean Boot state

Let’s explore the listed methods in a bit of detail!

1] Disable and re-enable the .NET framework

It has been observed in many cases, the reason you keep getting this error message is that Windows 10 comes with .NET Framework 4.7 and 4.5 preinstalled. However, some of the applications might require an earlier iteration of the framework like 2.0, 3.5, or 4.0. You can try the following method and check if it solves your problem.

  • Type ‘Turn Windows features on or off‘ in the Windows search bar and press Enter.
  • When the Windows Features window opens, click on the ‘+’ icon, adjacent to .NET Framework 4.7 Advance Services to expand its menu.
  • Uncheck all the options listed under it.
  • Uninstall the framework and restart your PC.
  • Next, reinstall the .NET Framework, go back to the Windows Features window, and click on the ‘+’ icon, adjacent to .NET Framework 4.7 Advance Services.
  • Now, check all the options back and restart the computer again.

Run the application/program to check if the problem is resolved.

2] Re-install Runtime Libraries

It’s likely that you are seeing the error because of an update, like the MS Visual C++ package which might not be installed properly or completely. To fix it, uninstall the current package and install a fresh copy.

  • Go to Programs and Features, find and highlight the Microsoft Visual C++ Redistributable Package.
  • Right-click it and choose the Uninstall option.
  • Reboot your computer.

Download the latest redistributable package from Microsoft then install it.

3] Troubleshoot in a Clean Boot State

In Windows, many different drivers, settings, and programs are interacting or communicating with each other simultaneously. This varied environment may lead to software conflicts that can manifest in several ways, as .NET Runtime Error 1026. Performing a clean boot may help in pinpointing the conflict and resolving it.

It is important to note that the same event can be recorded for a wide variety of applications and thus, have multiple solutions.

For instance, the ‘System.Net.HttpListenerException’, may be related to a problem with an HTTP request, caused by the local TCP/IP configuration or a network connection issue and thus have some different solutions.

If you are aware of any different solutions than the ones described above, share them with us in the comments section below.

Date: April 18, 2021 Tags: .NET

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A post-graduate in Biotechnology, Hemant switched gears to writing about Microsoft technologies and has been a contributor to TheWindowsClub since then. When he is not working, you can usually find him out traveling to different places or indulging himself in binge-watching.

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Net run time error

This forum has migrated to Microsoft Q&A. Visit Microsoft Q&A to post new questions.

Answered by:

Question

We have a VB.Net application and we are using Microsoft Visual Studio 2010 Professional for the development purpose.

The problem we are facing is that after deploying the application on client system it sometime gives .Net runtime error and the application crashes.

We have used Try Catch in all our code to handle exceptions then why it gets crashed due to this .Net runtime error?

After the application crash on viewing the error in Application event viewer we get the following 2 errors:-

Event Type: Error

Event Source: .NET Runtime

Event Category: None

Event ID: 1023

Date: 7/28/2011

Time: 4:04:38 PM

User: N/A

Computer: VERNIKA

Description:

Application: Opkey_CT.exe

Framework Version: v4.0.30319

Description: The process was terminated due to an internal error in the .NET Runtime at IP 791F9AAA (79140000) with exit code 80131506.

Event Type: Error

Event Source: .NET Runtime 4.0 Error Reporting

Event Category: None

Event ID: 1000

Date: 7/28/2011

Time: 4:04:39 PM

User: N/A

Computer: VERNIKA

Description:

Faulting application opkey_ct.exe, version 1.0.0.0, stamp 4e2fe406, faulting module clr.dll, version 4.0.30319.1, stamp 4ba1d9ef, debug? 0, fault address 0x000b9aaa.

Any suggestions to resolve this issue will be very helpful.

Regards, Premjeet Singh

Answers

Your symptoms strongly suggest that there is an issue with the configuration of that particular PC.

When you reinstalled the OS, did you wipe the OS hard drive partition and do a clean install? If not the issue could persist.

All replies

Have you verified the .NET Framework 4.0 installation on the client’s system?

I suggest you run the verification tool on the system where the problem is occurring:

If issues are revealed, then remove and reinstall.

An alternative approach is to consider that most errors like the one you cite are caused by the application that is using the .NET Framework, but are uncaught in the using application. reviewing and retesting your app may well reveal the problem.

As your app is VB.NET, the best place to get expert advice is:

When you post there, be sure to include code in the crashing area.

Thanks for replying.

I have used the verification tool as per your suggestion. On verifiying .Net Framework 4 Full it shows succeeded but on seeing the log file it shows some warning in error log file. The warnings are listed below:

[07/29/11,10:59:20] Beginning of new SetupVerifier error logging session

[07/29/11,10:59:20] Activity log file location: C:\DOCUME

[07/29/11,10:59:20] Error log file location: C:\DOCUME

[07/29/11,10:59:20] Build created on January 17, 2011

[07/29/11,10:59:20] Detected operating system: Windows XP (x86)

[07/29/11,10:59:27] ***WARNING*** File C:\WINDOWS\Microsoft.NET\assembly\GAC_MSIL\Microsoft.Windows.ApplicationServer.Applications\v4.0_4.0.0.0__31bf3856ad364e35\Microsoft.Windows.ApplicationServer.Applications.dll is not installed on the system

[07/29/11,10:59:33] ***WARNING*** File C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Microsoft.Windows.ApplicationServer.Applications.dll is not installed on the system

[07/29/11,10:59:34] ***WARNING*** File C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\ServiceModelPerformanceCounters.dll is not installed on the system

[07/29/11,10:59:34] ***WARNING*** File C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\ServiceModelPerformanceCounters.man is not installed on the system

[07/29/11,10:59:39] ***WARNING*** File C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\CLR-ETW.man is not installed on the system

[07/29/11,10:59:39] ***WARNING*** File C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\clretwrc.dll is not installed on the system

[07/29/11,11:01:02] SetupVerifier exiting with return value 0

Can you please let us know that the problem we are facing is due to these warnings or not?

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