Error on submiting page

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

I am using View state table to store temp data and then submit form with that data
 
Stack Trace for this :

ViewStateException: Invalid viewstate.
Client IP: ::1
Port: 52648
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.1; .NET4.0C)
ViewState: 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...]

[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +106
   System.Web.UI.ViewStateException.ThrowMacValidationError(Exception inner, String persistedState) +14
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +237
   System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37
   System.Web.UI.HiddenFieldPageStatePersister.Load() +207
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +105
   System.Web.UI.Page.LoadAllState() +43
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6785
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +242
   System.Web.UI.Page.ProcessRequest() +80
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +49
   ASP.career_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\826f1ac0\739bf940\App_Web_60sc6rwf.8.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75


Please help to solve the problem


Thnks,
Archana