So I'm currently having the same cannot continue bug that others have experienced.
Whenever I attempt to open my starter island I get the "Cannot find savefile of this YLAND" message.
Since it's apart of my start island I'm basically forced to fully reset. 
Just for the sake of noting I have not played on any other platform other than PC, and I was playing in "local hosting" mode with one other person. I have no idea what's causing this issue.
I have also added logs in a reply that is waiting to be approved. Thanks in advance for any assistance.