Unable to create user

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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.
#17672
Mar 25, 2008 19:34
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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:
#18516
Mar 25, 2008 19:43
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Thanks!
#18517
Mar 25, 2008 19:43
* You are NOT allowed to include any hyperlinks in the post because your account hasn't associated to your company. User profile should be updated.