I was afraid of that
I'm afraid you are suffering from this bug: http://forum.thesettlersonline.com/t...e-crashed-quot
Not much you or any of us players can do but wait till you island is fixed. There is a script that starts running around 02:00 AM (UK time) that should fix it.
I suggest you send a ticket to support anyway, just to let them know you had this issue as well (since support won't be in till tomorrow). You can use the contact form on this page: http://www.thesettlersonline.com/en/help-and-support.