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Docs > Troubleshooting > Installation and Update Issues > Could not load file or assembly 'X'
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V22.2
ASP.NET Web Forms Controls
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Cannot modify the Global Assembly Cache
Type 'X' exists in both assemblies / Type 'X' is ambiguous in namespace 'Y'
Could not load file or assembly 'Microsoft.Windows.Design.Extensibility ...'
Could not load file or assembly 'X'
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Could not load file or assembly 'X'

There are several causes for this issue.

Solutions:

Try recommendations in the following sections:

Ensure that you copied DevExpress assemblies into the website’s Bin folder after the website is deployed on the production machine. You can use the DevExpress Assembly Deployment Tool to deploy assemblies.