You may want to try one of the following:
If the above does not work, try reloading the page yourself. Note that you will lose any unsaved changes:
This form has to be reloaded. This most likely happened because your session has expired, which might
take to the login page. (If you think that you shouldn't see this message and that the problem persists,
please contact support.)
This example is described in details in the Orbeon Forms Tutorial.