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.
[ViewStateException: Invalid viewstate. Client IP: ::1 Port: 59591 Referer: http://localhost:52796/Main Path: /Default User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0 ViewState: 3zorm5vDC+GaPgvJXxozCFG2fNOXJ6wWpefO03lTdJitW2SHoc658AjXcZ69EE/ZUA5WcFf9lSBVvAkeHvKTdQ/W6TUzpqWpBeQkSeZhxFU=] [HttpException (0x80004005): 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. See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.] System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +116 System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +432 System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose) +8 System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +40 System.Web.UI.HiddenFieldPageStatePersister.Load() +248 System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +272 System.Web.UI.Page.LoadAllState() +36 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6704 System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245 System.Web.UI.Page.ProcessRequest() +72 System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21 System.Web.UI.Page.ProcessRequest(HttpContext context) +58 ASP.default_aspx.ProcessRequest(HttpContext context) in c:\Users\AMNK\AppData\Local\Temp\Temporary ASP.NET Files\vs\00345666\5dcbba65\App_Web_54yu51cx.2.cs:0 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69
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