SleepingProgrammer

Sorry for reviving this but did you get any luck here? Got the same issue. Changed to .JSON on server but still nah

TypeError: Cannot read properties of undefined (reading 'then') Getting this from a fresh install, not sure if I missed some sort of setup stuff. 

Thanks for letting me know and happy new year! I haven't had the time to try out your earlier suggestion, does that mean I can just force colyseus/core to use...

Was able to make a work-around by creating two instances and showing one or the other, however, let me know if there is a better one. Thanks.