A quick little post, but something that is strangely hard to search for, so here’s hoping this becomes a good search result for this error.
On Tabletop Simulator, it’s possible to see a bunch of weird errors with mods. You might see things like
[XmlLayout] Ignoring duplicate id value 'X. Id values must be unique <XX>.
This is probably one of the most common errors I see, and until today, I had no idea why I was seeing them at all. As it turns out, if you have logging enabled in Tabletop Simulator (
-log launch option), you’ll see errors in mods. It seems like most people have logging turned off, so unless you’re working on your own mod, you may as well turn it off.