MESS runner

How do I configure a game to use the mess runner? The only tab I’m getting is “game info”, there’s no way to enter the rom.

I opened lutris from the terminal and tried to create a new mess game, this was the terminal output
Traceback (most recent call last):
File “/usr/lib/python3/dist-packages/lutris/gui/config/”, line 400, in on_runner_changed
File “/usr/lib/python3/dist-packages/lutris/gui/config/”, line 414, in _switch_runner
File “/usr/lib/python3/dist-packages/lutris/gui/config/”, line 421, in _rebuild_tabs
File “/usr/lib/python3/dist-packages/lutris/gui/config/”, line 320, in _build_runner_tab
self.runner_box = RunnerBox(self.lutris_config,
File “/usr/lib/python3/dist-packages/lutris/gui/config/”, line 635, in init
File “/usr/lib/python3/dist-packages/lutris/gui/config/”, line 118, in generate_widgets
helptext = helptext + “\n\n” if helptext else “”
TypeError: can only concatenate tuple (not “str”) to tuple

Python is not one of my languages, but the word error is usually bad. Any ideas on what this means?