I faced the same issue and after multiple tries, I figured the issue is due to incorrect PSK. Even if your town/city is listed in the drop down, it might not have a PSK. There is a link on the same portal to locate the PSK. It is not straight-forward too but you should be able to locate it.
They really make it user friendly by throwing the "Unknown Technical Error" back to the user.
your reply is vague and useless, even if we find out our PSK? then what we can't still track the application status using cat**** number