Skip to main content
BuyLog In
ASP.NET Web Forms Controls
Search in…
Docs > Troubleshooting > Installation and Update Issues > Cannot modify the Global Assembly Cache
All docs
V24.1
ASP.NET Web Forms Controls
Prerequisites
Supported Browsers
What's Installed
Get Started
Upgrade to a New Version
Common Concepts
Components
Security Considerations
Redistribution and Deployment
Troubleshooting
Get Started
Common Issues
Client-Side Issues
Server-Side Issues
Installation and Update Issues
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'
Performance Issues
Grid-Related Issues
Themes-Related Issues
Get More Help
.NET Framework API Reference
Client API Reference
Download CHM

Cannot modify the Global Assembly Cache

Error Description

This error may occur when the DevExpress installer does not have access rights to the GAC or security software (antivirus or firewall) blocks access. The installation log file can contain the following information: 

09.05.2019 18:36:16 *********************[Error]*********************
Cannot modify the Global Assembly Cache for DevExpress.XtraCharts.vXX.Y.Web.dll - -2147024891
*************************************************
09.05.2019 18:36:16 --- Updating the Global Assembly Cache for DevExpress.XtraCharts.vXX.Y.Web.Design.dll
09.05.2019 18:36:16 *********************[Error]*********************
Cannot modify the Global Assembly Cache for DevExpress.XtraCharts.vXX.Y.Web.Design.dll - -2147024891
*************************************************
09.05.2019 18:36:16 --- Updating the Global Assembly Cache for DevExpress.Web.ASPxGauges.vXX.Y.dll
09.05.2019 18:36:16 *********************[Error]*********************
Cannot modify the Global Assembly Cache for DevExpress.Web.ASPxGauges.vXX.Y.dll - -2147024891

Solution

Use the Microsoft .NET Framework Repair Tool to restart and re-register Windows services, modify access control lists, and clear unnecessary/missing/incorrect files and directories in the GAC folder.