Add support for opening menu RewardZ mod
net.rewardz.screen.RewardsScreen

I don't add support for mod menus anymore. Most incompatible menus are pretty difficult to add support for (from both the other mod's side and FancyMenu's side). Sorry.

Well, that's already "fixed" in FancyMenu v3 (currently in development), because in v3 that message does not exists anymore ^^

Thanks for the answer. Then it turns out that the error message is misleading, perhaps it is worth fixing lang custombuttons.action.opengui.cannotopengui