Error while uploading the mission

Hi all,

I am not able to load any mission to my Kakute F7 running Arduplane Dev 4.3.0 7284FBC9 created by Ardupilot custom server

. I am getting this error while trying to upload the mission. Serial protocol is Mavlink2 and i am trying via USB cable straight to the FC from the PC. Any ideas please? Thanks.

Update :
Flashed my FC with latest dev from Ardupilot custom server and now I can upload the missions.