Runtime Error: /opt/var/mongoose/lib/epg.class:583
You need to regenerate the disk copy of the EPG.
Go into the Guide pages using the Humax remote
Wait until the "updating information ..." message disapears from the top of the screen or the background TV channel audio returns (usually about 45s to 1 minute)
Reboot
Wait 5 minutes or so for the new epg data to be processed
Try the webif again