Error starting pipeline

I did all the installations as indicated on the site, using ciao-4.14, but when I enter the directory and run python clusterpyxt.py I get the following message:

gabriel@gabriel-Aspire-A515-51G:~/astrosoft/ClusterPyXT$ python3 clusterpyxt.py /home/gabriel/astrosoft/ClusterPyXT/pypeline_config.ini qt.qpa.plugin: Could not load the Qt platform plugin "offscreen" 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.

Abortado (imagem do núcleo gravada)