Troubleshooting

• Jul 08, 2025

This section describes how to troubleshoot errors that can occur when you use DevExtreme ASP.NET Core components in Visual Studio.

• ‘Add DevExtreme to the Project’ menu item is unavailable
• ‘Do you want to upgrade DevExtreme in the project’ dialogue is unavailable
• ‘DevExpress Template Gallery Failed’ error occurs
• DevExtreme Templates are unavailable
• DevExtreme tools and wizards are unavailable
• ‘Upgrade DevExtreme Resources’ menu item is unavailable
• ‘Uncaught TypeError: $(…).dxWidget is not a function’ error occurs
• A drop-down editor does not show data
• 'Uncaught TypeError: DevExpress.assertDevExtremeVersion is not a function' error occurs