base error bitmask gui

I installed bitmask by repository leap in debian. everything was fine until I got this error.

These are bitmask log:

bitmaskd.log

that is bitmask version: Package: bitmask Version: 0.10.5+020180328220318.47860+0.10.5+stretch0.g8a89b360 Priority: extra Section: metapackages Maintainer: Kali Kaneko kali@leap.se Installed-Size: 22.5 kB Depends: bitmask-core, bitmask-qt, bitmask-vpn, bitmask-mail Homepage: https://bitmask.net Download-Size: 12.4 kB APT-Manual-Installed: yes APT-Sources: http://deb.leap.se/client staging/stretch amd64 Packages Description: Metapackage to install bitmask desktop client The LEAP project aims to secure everyday communication. . This package provides a metapackage that installs the qt client, bitmask-vpn and bitmask-mail.

regards.