omv extras issue

"/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f9e2ead8730>
Traceback (most recent call last):
  File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Paketlisten werden gelesen... Fertig
W: The repository 'https://dl.bintray.com/openmediavault-plugin-developers/arrakis stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'https://openmediavault.github.io/packages arrakis Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Fehlschlag beim Holen von https://dl.bintray.com/openmediavault-plugin-developers/arrakis/dists/stretch/main/binary-amd64/Packages
E: Fehlschlag beim Holen von https://openmediavault.github.io/packages/dists/arrakis/main/binary-amd64/Packages
E: Einige Indexdateien konnten nicht heruntergeladen werden. Sie wurden ignoriert oder alte an ihrer Stelle benutzt.[/code]