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Docs > Troubleshooting > Server-Side Issues > The 500.19 error - The requested page cannot be accessed because the related configuration data for the page is invalid
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V24.2
ASP.NET Web Forms Controls
.NET Support and Migration
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Troubleshooting
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Common Issues
Client-Side Issues
Server-Side Issues
Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ASPxHttpHandlerModule'
Icons, images, and scripts are missing
The target 'X' for the callback could not be found or did not implement ICallbackEventHandler
The controller for ASPxUploadProgressHandlerPage.ashx was not found or does not implement IController
Internal Error. Unable to find the X resource in the Y
Response.Redirect cannot be called in a Page callback
Why you cannot download files on callbacks
A primary key field specified using the KeyFieldName property is not found
The 'Key expression is undefined' error occurs when you use LinqServerModeDataSource / EntityServerModeDataSource
Data binding methods such as Eval(), XPath(), and Bind() can only be used for a databound control
Could not find control 'X' in ControlParameter 'Y'
'The X has no access to path Y' or 'Access to the path X is denied' (Image and File Controls)
The 500.19 error - The requested page cannot be accessed because the related configuration data for the page is invalid
An error occurred while encrypting a control's callback state
Cannot unregister UpdatePanel
Installation and Update Issues
Performance Issues
Grid-Related Issues
Themes-Related Issues
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.NET Framework API Reference
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