Hi AFAIK, the Magknight Aviation Magknight 787AE (assuming that is the aircraft you have the problem with?) uses the same dataset as:
addon name=“X-Plane GNS430, FF757/767/777, X-Crafts Embraer E-175, Aerobask SkyView, JRollon Planes CRJ200, JARDesign A320/A330, ToLiss A319 (XP10), STMA Aircraft, Magknight 787AE” .
That is it expects to see a GNS430 folder in your Custom Data folder as shown in my last pic.
Also make sure you have the X-Plane 11 date set so it’s within the ‘valid’ period of the AIRAC cycle your using.
If you still have a problem after that, I suggest you follow what Richard said and:
- Exit X-Plane.
- Then removing all the files from your /Custom Data folder (don’t remove the folder itself, just the contents).
- Running FMS Data Manager again, and updating both X-Plane 11 and the Magknight 787AE.
- Exit FMS Data Manager.
- Then run X-Plane 11 again, and see if you still have problems, using both the Default B737 and the Magknight 787AE one after another.
If you do have a read of this : FAQ - Installing Navdata AIRAC Updates