It's just a warning so you can ignore it. For the reason why this appeared, unlike for example the BiomeRetriever class which safely checks and catches ClassNotFoundException type when a mod is not ...

needs more informationUse if we need more information for a specific ticketUse if we need more information for a specific ticket theia :1.36.0 java :1.8 metals plugin:1.16.0 While i debug a scala file ...