Failed to initialize the storage

HI,

I got an error when trying to backup:
STORAGE_NOT_CONFIGURED The storage has not been initialized
The storage has not been initialized

So i deletet the backuppoint and readded it, done it before and it worked then.
But when adding Storage with the same ID and endpoint i get this now:

Failed to initialize the storage at /Backup-XXXXXXXX: Failed to configure the storage: open /Backup-XXXXXX/config.dfnimdou.tmp: no such file or directory.

How do i fix it ?