If you can dump the entire error into pastebin and link it here, I might be able to tell you what's going wrong. That "large string of text" is probably a stack trace that'll tell us what's crashing.
That stack trace looks similar to one I saw yesterday. See the troubleshooting section in the README and try the last thing mentioned:
I'm seeing an error that looks like "[Errno 22] Invalid argument
This usually indicates a problem with ComfyUI's configuration. As discussed in this issue, try changing the port that ComfyUI is using (in the Server-Config settings).