xpra xorg bug

Jun 08 11:07:42 systemd[1]: Started xpra display.
Jun 08 11:07:42 xpra[19595]: 2018-06-08 11:07:42,674 cannot access python uinput module:
Jun 08 11:07:42 xpra[19595]: 2018-06-08 11:07:42,674  No module named uinput
Jun 08 11:07:42 xpra[19595]: (EE)
Jun 08 11:07:42 xpra[19595]: Fatal server error:
Jun 08 11:07:42 xpra[19595]: (EE)
Jun 08 11:07:42 xpra[19595]: Invalid argument for -logfile - "/run/user/1000/xpra/Xorg.:42.log"
Jun 08 11:07:42 xpra[19595]:         With elevated privileges -logfile must specify a relative path
Jun 08 11:07:42 xpra[19595]:         without any ".." elements.
Jun 08 11:07:42 xpra[19595]: (EE)
Jun 08 11:07:42 xpra[19595]: Please consult the The X.Org Foundation support
Jun 08 11:07:42 xpra[19595]:          at http://wiki.x.org
Jun 08 11:07:42 xpra[19595]:  for help.
Jun 08 11:07:42 xpra[19595]: (EE)
Jun 08 11:07:45 xpra[19595]: 2018-06-08 11:07:45,692 Error: failed to connect to display :42
Jun 08 11:07:45 xpra[19595]: 2018-06-08 11:07:45,692  could not connect to X server on display ':42' after 3 seconds
Jun 08 11:07:45 xpra[19595]: 2018-06-08 11:07:45,693 killing xvfb with pid 19598
Jun 08 11:07:45 xpra[19595]: 2018-06-08 11:07:45,694 failed to kill xvfb process with pid 19598:
Jun 08 11:07:45 xpra[19595]: 2018-06-08 11:07:45,694  [Errno 3] No such process
Jun 08 11:07:45 systemd[1]: xpra@XXX.service: Main process exited, code=exited, status=1/FAILURE
Jun 08 11:07:45 systemd[1]: xpra@XXX.service: Failed with result 'exit-code'.