.NET troubleshooting

.NET required during installation

Description

Upgrading the Robot with MSI installers fails with the following error: "You must install .NET Desktop Runtime to run this application."

Potential issue

The .NET runtime installed on your machine may be corrupted.

Solution

Uninstall the .NET runtime from your device and run the installer again.

Activities cannot find .NET Runtime

Description

Workflows using specific activity packages fail when executed by 2023.4.0 and newer robots. The following errors are displayed:

• "To run this application, you must install missing frameworks for .NET."

• "To run this application, you must install .NET."

Impacted activity packages

• UiPath.Form.Activities version 2.0.x

• UiPath.IntelligentOCR.Activities

• UiPath.MobileAutomation.Activities

• UiPath.Vision

• UiPath.DocumentUnderstanding.Activities

• OCR related activities in the UiPath.UIAutomation.Activities package

• UiPath.OmniPage.Activities

• UiPath.OCR.activities

Solution 1

Upgrade the activity packages of the problematic workflows to the latest versions.

Solution 2

Add an Invoke Code activity at the start of the problematic workflow with the following snippet:

System.Environment.SetEnvironmentVariable("DOTNET_ROOT", System.AppContext.BaseDirectory)

Solution 3

Install the .NET Windows runtime or the missing .NET frameworks.

.NET 8 projects fail to run

Description

Executing a Windows or a cross-platform process built using Studio 2024.2, on a 2023.12 Robot version or lower, fails with the following error: "RemoteException: NU1202: Package <package_name> <version> is not compatible with net6.0-windows7.0 (.NETCoreApp,Version=v6.0). Package <package_name> <version> supports: net8.0-windows7.0 (.NETCoreApp,Version=v8.0)."

Potential issue

NuGet tries to resolve a package for .NET 6, whereas your automation was built using .NET 8. Such forward compatibility is not supported.

Solution

Upgrade your Robots to version 2024.2.