Is the answer yes, you have modified the template then? If so, document your changes and then revert that template and try and see if it works with stock setup.
Is the answer yes, you have modified the template then? If so, document your changes and then revert that template and try and see if it works with stock setup.
Have you recently uninstalled add-ons related to members list? If you go into debug, can you verify the route actually exists within the database? Might be worth it to rebuild master data.