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Traceback (most recent call last):
  File "C:\Users\ThinkTank\AppData\Roaming\Blender Foundation\Blender\2.90\scripts\addons\UE4_Vehicle_Rigging_Addon_v0_6_1\", line 335, in execute
    O.object.mode_set(mode='EDIT', toggle=False)
  File "D:\Program Files\Steam\steamapps\common\Blender\2.90\scripts\modules\bpy\", line 201, in __call__
    ret = op_call(self.idname_py(), None, kw)
RuntimeError: Operator bpy.ops.object.mode_set.poll() failed, context is incorrect

location: <unknown location>:-1

I was assigning bone head location for axle. It worked for the door but when doing axle it did this.

From the info, you gave can't tell where's the problem. Does the error happen all the time? If you could provide me with your blender file and the steps on how to get this error, I could fix this error. 

(2 edits)

My fault it's been a while and I haven't touched it since. I got it working in the end by just doing it from scratch.

I apologies I cannot provide what you request atm :/

Best I can give you is try renaming bones.

The reason it didn't work first time is because I didn't follow the video step by step, I went slightly off course when I tried renaming things.