Meross MDP100 wifi dimmer, java.lang.Exception: async request error

Using the custom drivers located at
I'm able to connect to the dimmer and see current status, but get an error anytime I try to change status.
"java.lang.Exception: No response data exists for async request on line 198 (method onoffResponse)"

It's a new device with the most recent firmware. I'm curious as to whether anyone else is having the same issue, and as to whether I should be posting this here, or on github. I just started with the hub a couple days ago, so the chance I'm doing something dumb is relatively high. (Like having my PC and HE set to two different time zones, which kept me from configuring the drivers for like two hours till I noticed...)