Error with Openhab Cloud Connector extension

[sihui]

If you were coming from a build older than #624 you have to reconfigure everything anyway:

Replacement of mapdb by jsondb

All, I feel sorry to tell you that the distro build #624 brings another breaking change, but as in the past, I am certain that it is for the better! There has been a long discussion around the problem that the Things that are created through the Paper UI are stored in a binary database (the mapdb, data to be found under userdata/mapdb), which is not readable or manually editable (e.g. for fixing or cleaning). @chris came up with a nice new implementation of a storage service (luckily, ESH is …

So yes, I would do a new install. Save your config folder and reapply to your new installation after openHAB starts up again properly.
Good luck.