Check xvfb

app.py

@@ -6,6 +6,12 @@ from stpyvista import stpyvista
 st.title("A cube")
 st.info("""Code adapted from https://docs.pyvista.org/user-guide/jupyter/pythreejs.html#scalars-support""")
 
+from stpyvista.utils import start_xvfb
+
+if "IS_XVFB_RUNNING" not in st.session_state:
+  start_xvfb()
+  st.session_state.IS_XVFB_RUNNING = True 
+
 ## Initialize a plotter object
 plotter = pv.Plotter(window_size=[400,400])