The error message says “Failed to find route” which is simple but not user-friendly because it doesn’t address the problem they are having, so they comment under the invoice, “It didn’t work.” and this has the potential to discourage people and make them think Lightning doesn’t work well, because they don’t understand what went wrong. A more descriptive message would go a long way here. It helps to put yourself in the shoes of the newest of users who don’t know what routes are, they just see something that looks broken.