Hi
I can't create a new user. It's a standard installation of EPiServer 4.61 with service pack 5.
The error I get is:
Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ page enableeventvalidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
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Hi.
See this FAQ:
http://www.episerver.com/en/EPiServer_Knowledge_Center/FAQ_EPiServer_4/982/Event-validation-is-enabled-using-pages-enableEventValidationtrue-in-configuration-or--Page-EnableEventValidationtrue-in-a-page/
This error is caused by running ASP.NET 2.0 with an incompatible web.config setting. In order to resolve this you need to set "enableEventValidation" to "false".
Open your web.config file and replace the element to match the following:
Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ page enableeventvalidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
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