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Server Error in '/NH' Application.

Unable to validate data.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Unable to validate data.

Source *******

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and ******** of the exception can be identified using the exception stack trace below.
Stack Trace:

[HttpException (0x80004005): Unable to validate data.] System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +195 System.Web.UI.LosFormatter.De******ize(String input) +60[HttpException (0x80004005): Authentication of viewstate failed. 1) If this is a cluster, edit <machineKey> configuration so all servers use the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. 2) Viewstate can only be posted back to the same page. 3) The viewstate for this page might be corrupted.] System.Web.UI.LosFormatter.De******ize(String input) +117 System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +101[HttpException (0x80004005): Invalid_Viewstate Client IP: 10.75.0.22 Port: 61612 User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ViewState: dDwtODE4MDIwNTQ4O3Q8O2w8aTwxPjtpPDM+Oz47bDx0PDtsPG k8MT47aTwzPjtpPDk+Oz47bDx0PHA8bDxzcmM7PjtsPEltYWdl cy9SZXN1bHQuZ2lmOz4+Ozs+O3Q8cDxwPGw8VGV4dDs+O2w82L HZgtmFINin2YTYt9mE2Kg7Pj47Pjs7Pjt0PHA8cDxsPFRleHQ7 PjtsPNin2YTYsdmC2YUg2KfZhNiz2LHZijs+Pjs+Ozs+Oz4+O3 Q8cDxsPGlubmVyaHRtbDs+O2w8Mjs+Pjs7Pjs+Pjs+kzlgUzUf ubaJ9kSbyfdvh0IssNc= Http-Referer: http://www.se.com.sa/nh/(nypuzkbrm4q....aspx?switch=2 Path: /nh/WelcomeApp2.aspx.] System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +446 System.Web.UI.Page.LoadPageViewState() +18 System.Web.UI.Page.ProcessRequestMain() +447

Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300

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