What we see in that the DisplayLink kernel extension is not running at all.
First, make sure you are running the latest version of 10.14.5 (not early betas) and have allowed the KEXT to run:
https://support.displaylink.com/know...ality-not-enab
Also, as it seems you are using 5.1:
macOS 10.14.5 requires kernel extensions to be notarized. DisplayLink have notarized the drivers already while the O/S was still in dev beta preview, and released a 5.1.1 version that's available on the Downloads site.
See
https://displaylink.org/forum/showthread.php?t=66574
Thanks
Michal