Chrome Capture still nothing

Hi, I fixed the port problem, so CC4C is now running with ports set to 5700:5589. However, no programs are getting through and Docker shows error:

2024-12-19 14:36:16 [2024/12/19 19:36:16.955] Chrome Capture server listening on port 5589
2024-12-19 14:36:16 _XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be created.

Any idea what this means?