map vanished

i created a osm with poi, but after it worked several month it is not available anymore.
see:
http://heidingsfeld.de/images/stories/Stadtplan/
anyone any idea what happend and how i can see it again?!
thanx for help.

das sollte Dir weiter helfen
http://forum.openstreetmap.org/viewtopic.php?pid=251814#p251814

Moin,

if you changed nothing recently it’s likely that that version 2.12 of openlayers causes this problem. Switch back to 2.11 or adjust your code.

Cheers,

-moenk