Originally Posted by pandaperth

We posted our responses at the same time.


I disagree with you on this point.
Yes, if the error message is still showing after you've chosen all your flights, then you cannot proceed.
But I have found that sometimes the message is displaying because the tool has chosen an airline that is allowed on a Global Explorer but not on a Oneworld Explorer (and the global explorer has a maximum mileage limit).
I was getting message while building my ex-Cairo DONE5 last month. The tool had chosen Fiji Airlines for my SYD-NAN and NAN-SYD flights. I changed to qantas, and the error disappeared. (Total mileage of my ticket is ~42,000)