Virtscreen gives error on launch: couldn't load "xcb" even though it was found

[physicophilic]

I firstly want to say thanks for making this. Here's my issue:

I was trying to sort out issue #19 for myself, but in the process of reinstalling I ended up with the following message when I launched the app:
`qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

Aborted (core dumped)
`
How to fix this? one weird thing I did was edit the config.json file in the ./config/virtscreen folder.
The last line was about the version of x11vnc, and since I had installed 0.9.16, I changed it to that,
instead of 0.9.15.

I don't know what to do anymore! I really wanted to make this thing work ! Ugh.