The file islands.json is corrupted - if you're the only player on the server and you're living at the first island - just remove the current file and let the server recreate a new one - and then it should be OK.
If it's a server where you have more players, restore the islands.json file from any of the backups.
The latest crash still indicates that the islands.json was corrupted.It is a server for more players and I tried both suggestions, can I try anything else to fix this.
Nothing was working so I started a new server and just brought over the old "world" folder and that fixed my problem don't know exactly what was wrong.
Thanks for the suggestions though