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/common.py”, line 400, in on_runner_changed
self._switch_runner(widget)
File “/usr/lib/python3/dist-packages/lutris/gui/config/common.py”, line 414, in _switch_runner
self._rebuild_tabs()
File “/usr/lib/python3/dist-packages/lutris/gui/config/common.py”, line 421, in _rebuild_tabs
self._build_runner_tab(“game”)
File “/usr/lib/python3/dist-packages/lutris/gui/config/common.py”, line 320, in _build_runner_tab
self.runner_box = RunnerBox(self.lutris_config, self.game)
File “/usr/lib/python3/dist-packages/lutris/gui/config/boxes.py”, line 635, in init
self.generate_widgets(“runner”)
File “/usr/lib/python3/dist-packages/lutris/gui/config/boxes.py”, 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?