Should have checked the logs.
In the early design stages I stored quiet a bit of data in the container, and snapshotted that. It filled my disk in no time. Even up tot the point new snapshot entries were taken, but the disk was already full.
As some of the snapshots were like created in the /var/snap/lxd/common/lxd folder but were not show in lxc info, I just deleted the snapshot folders.
And that is were is got a problem.
Lxc list now showed a certain snapshot, but the folder directory was no longer there, and therefor the whole thing crashed.
I now deleted the snapshot using lxd delete xx/xx and everything worked fine…
@stgraber Thanks for the really fast replies, and the awesome software stuff! have learned quiet a bit lately!