Check that your 'HDD' (depends what you have mounted as HDD) contains a file named 'epg.dat',
normally in its root directory.
If no file exists then check that you have set up the path correctly to save the EPG data to the HDD.
BTW, to my mind, 462,360 is an unusually high number of events to import.
For instance mine, for full sky and full IPTV is 121,289 and that's for a 'supposed' 4 day list.