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I'm on 2010 Sharepoint. some users get the error when they're logged in with "remember me" checked and being inactive for more than 2 days. we have the cookies set to expires after 2 days and it suppose to kick you out and make you logon again. PLEASE HELP! here's the full error:

Server Error in '/' Application. ______________________ Exception of type 'System.ArgumentException' was thrown. Parameter name: encodedValue 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.ArgumentException: Exception of type 'System.ArgumentException' was thrown. Parameter name: encodedValue

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

Stack Trace: [ArgumentException: Exception of type 'System.ArgumentException' was thrown. Parameter name: encodedValue]
Microsoft.SharePoint.Administration.Claims.SPClaimEncodingManager.DecodeClaimFromFormsSuffix(String encodedValue) +25971126
Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.GetProviderUserKey(String encodedIdentityClaimSuffix) +296
Microsoft.SharePoint.ApplicationRuntime.SPHeaderManager.AddIsapiHeaders(HttpContext context, String encodedUrl, NameValueCollection headers) +845
Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.PreRequestExecuteAppHandler(Object oSender, EventArgs ea) +352
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171

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