System.Web.HttpException: Invalid viewsta

[Chan]

Ciao a tutti non so + dove sbattere la testa
ho asp.net 2.0 nel mio web config ho messo

<machineKey validationKey="5B4F4E3BE19C1B7F1DEE6A27E07A8733532983B3AF2F28E62021894BE02C4A56EE33E8FA74077B18F1F09DA6861F1910920CDAEC3798B9C66A35BD3BCA63EA29" decryptionKey="8BFFCD5AC224074835D2227D1951D5700BBA2044B173E3DD574B75D2F66392EB" validation="SHA1" decryption="AES" />

<pages enableEventValidation="false" enableViewStateMac="false" viewStateEncryptionMode ="Never" maxPageStateFieldLength="100" >

Error Message: Exception has been thrown by the target of an invocation.
Stack Trace:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Web.HttpException: Invalid viewstate. at System.Web.UI.Page.DecryptString(String s) --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) at System.Web.Handlers.ScriptResourceHandler.DecryptString(String s) at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString) at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context) at System.Web.Handlers.ScriptResourceHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
________________________________________
Browser Capabilities
Type = IE7
Name = IE
Version = 7.0
Major Version = 7
Minor Version = 0
Platform = WinNT
Is Beta = False
Is Crawler = False
Is AOL = False
Is Win16 = False
Is Win32 = True
Supports Frames = True
Supports Tables = True
Supports Cookies = True
Supports VBScript = True
Supports JavaScript = 1.2
Supports Java Applets = True
Supports ActiveX Controls = True
Supports JavaScript Version =

[djciko]

idem dell'altro thread