My participants have received the error message „An application error has occured“
This Message has the following background:
EFS has recognized an invalid HTTP request. This can occur e.g. in Internet Explorer, when the participant navigates through the survey by using the browser-sided Forward / Back Buttons. Repeatedly pressing F5 to reload the page might also cause this behavior, just like an involved proxy-server which caches data.
The participant will be able to continue the survey as intended by clicking on the survey link again.