If you look in the hotevent element named 'error badfetch' in the Studio
App - is the event name 'error.badfetch' or 'error.badfetch.http.404'
because they mean different things.
error.badfetch usually means the the voice browser's fetchtimeout timer
expired, waiting for VXML Server to return from a slow web service or DB
interaction.
error.badfetch.http.404 usually means the voice browser couldn't find an
audio file one of the previous audio elements. For this you can look on
your media server in the IIS logs, (c:\inetpub\logs\LogFiles\w3svc\
directory) and look for 404.