Dunde Aynısı yazdım ama sılınmıs konu-Server Error

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Server Error in '/sobeelogin' Application.
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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.
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: 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 Error:


[No relevant source lines]


Source File: c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\sobeelogin\a6456377\46ac4d9f\App_Web_3ocvqbkv.2.cs Line: 0

Stack Trace:


[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +10986325
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +295

[ViewStateException: Invalid viewstate.
Client IP: 88.251.213.207
Port: 9170
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)
ViewState: /wEPDwULLTIxMDA3MTg3MTMPZBYCZg9kFgRmDw9kFgQeB29uRm9jdXMFGFR4dEZvY3VzKHRoaXMsJ1RlbCBObycpOx4Gb25CbHVyBRdUeHRCbHVyKHRoaXMsJ1RlbCBObycpO2QCAQ8PZBYGHwAFGFR4dEZvY3VzKHRoaXMsJ8WeaWZyZScpOx8BBRdUeHRCbHVyKHRoaXMsJ8WeaWZyZScpOx4FdmFsdWUFBsWeaWZyZWQYAQUeX19Db250cm9sc1JlcXVpcmVQb3N0QmFja0tleV9fFgEFCGJ0bkVudGVy+ZWbiIc10hRlX0Y50mPU/EmaAXc=
Referer: http://www.istanbuloyun.com/sobeelogin/logingame.aspx
Path: /sobeelogin/logingame.aspx]

[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.]
System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +148
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +10959605
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +59
System.Web.UI.HiddenFieldPageStatePersister.Load() +10959704
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +11043464
System.Web.UI.Page.LoadAllState() +46
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11038983
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11038522
System.Web.UI.Page.ProcessRequest() +91
System.Web.UI.Page.ProcessRequest(HttpContext context) +240
ASP.logingame_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\sobeelogin\a6456377\46ac4d9f\App_Web_3ocvqbkv.2.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +599
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171

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geçmiş olsun bir bilgim yok bu konuda..

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