Visual Studio crashes when opening Mission Planner design

Ground Control Software Mission Planner
1

I have downloaded the source code from Mission Planner.
I managed to succesfully open it and build it with Visual Studio 2015. But, whenever I try to open FlightPlanner.cs or FlightData.cs in design mode, it crashes.
Does someone know how to fix this?

2

switch to vs 2017, and make sure you are using current master code

3

Well, the problem also ocurred in Visual Studio 2017 (that was the reason why I changed to VS15). Already using the current master code also.

4

Updating: FlightPlanner.cs appears to be loading okay, but FlightData still does not load in Design Mode.