Error renaming on windows client

In one of my Windows client the backup does not work anymore.

I get the following in the log:

Error renaming urbackup/data/filelist_new_0.ub to urbackup/data/filelist.ub. Eine Datei kann nicht erstellt werden, wenn sie bereits vorhanden ist. (code: 183)
Constructing of filelist of "xxxxx" failed: error - index error
Backup had an early error. Deleting partial backup.

Any way to fix this?