Manjaro KDE can't boot from pendrive

Now I using Manjaro XFCE version, but want to switch KDE version.
When I start booting from usb pendrive, both in option with open source drivers or with proprietory drivers, booting stops when the process come to this position:

[FAILED] Failed to start **Authorization Manager.**
See 'systemctl status polkit.service' for details.
[DEPEND] Dependency failed for **Modem Manager**.
......... (Here some process which are ok)

[OK] Reached target **Graphical Interface**. 

How can I solve this, please?

Tried to reproduce, but cannot. Try to recreate the bootable usb.

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