Hi, I'm a newbie in RC Héli. I bought an Hirobo Sceadu Evo .50 and flew it a couple of time. today I got an incident, at first look it seems only a little part is missing. (I include the picture). But since then when my Tx is on this message is appearing: MIX OFF! TH-HOLD and it keep beeping. What does that mean? My Tx is a Futaba 7chp

Thanks in advance...

Pierre