Fixed on twitter https://www.reddit.com/r/Videostream/comments/c9c7ew/videostream_chrome_error_on_localhost5557_err/?

FOR THOSE HAVING PROBLEMS:
try this:
Try reinstalling Videostream for me? First go to Chrome://extensions and remove Videostream.

Then, reboot your computer, after you do that, download it again from here: https://chrome.google.com/webstore/detail/videostream-for-google-ch/cnciopoikihiagdjbjpnocolokfelagl?hl=en

Finally, pin it to your desktop.

Let me know if this solves your problem!

Mick-Fox

Works. THX for the help. I uninstalled desktop version, rebooted and then installed chrome extension and ALL good now.