Getting "Some bones are missing from the bind pose" error while importing (4-27)

Hello all, I’m new to both UE and Blender (have used Maya and Unity earlier) .
I’m trying to set up a vehicle here in UE4 and for that, I’ve rigged the vehicle in Blender following all the axis and scales but whenever I try to import that file(fbx) in UE4 i get errors " The following bones are missing from the bind pose(and then all 4 of my tire bones names". Don’t know what’s wrong here, if i still import the car everything looks good but I’m not able to set up a proper physics body(Single Convex Hull). UE is crashing whenever I’m trying to generate a Single convex hull for tires only(body is working fine). Any Help?