Validation of viewstate MAC failed.(plz help urgent)

[Vpagrawal_master1]

New Message on dotNET User Group Hyd Validation of viewstate MAC failed.(plz help urgent) Reply   Reply to Sender   Recommend Message 1 in Discussion From: Vpagrawal_master1 Hello   i m getting following error . when i deploy asp.Net2.0 application..   Error Details : Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <MACHINEKEY>configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. Source : System.Web Stack Information : at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) at System.Web.UI.HiddenFieldPageStatePersister.Load() at System.Web.UI.Page.LoadPageStateFromPersistenceMedium() at System.Web.UI.Page.LoadAllState() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) please View other groups in this category. Also on MSN: Start Chatting | Listen to Music | House & Home | Try Online Dating | Daily Horoscopes To stop getting this e-mail, or change how often it arrives, go to your E-mail Settings. Need help? If you've forgotten your password, please go to Passport Member Services. For other questions or feedback, go to our Contact Us page. If you do not want to receive future e-mail from this MSN group, or if you received this message by mistake, please click the "Remove" link below. On the pre-addressed e-mail message that opens, simply click "Send". Your e-mail address will be deleted from this group's mailing list. Remove my e-mail address from dotNET User Group Hyd.