this is error when uploding file:

Errore di run-time di Microsoft BLOCKED SCRIPT The state information is invalid for this page and might be corrupted.
   in System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
   in System.Web.UI.ViewStateException.ThrowViewStateError(Exception inner, String persistedState)
   in System.Web.UI.HiddenFieldPageStatePersister.Load()
   in System.Web.UI.Page.LoadPageStateFromPersistenceMedium()