How do I fix bpy.ops.object.mode_set.poll() failed, context is incorrect?

Question

I am trying to convert a metaball object to a mesh, but I cant pass this stage. I am basically stuck. I checked out all the bpy.context and context override and bpy.ops posts and documents and i still can't make these 2 ops work :( I do not understand why they need special context.

Traceback (most recent call last):

  File "C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\Dupper\__init__.py", line 95, in dupper
    bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
  File "C:\BLENDER_28\2.80\scripts\modules\bpy\ops.py", line 200, 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

location: <unknown location>:-1



def makedup(obj):

    object=obj

    bpy.ops.object.select_all(action='DESELECT')
    bpy.context.view_layer.objects.active = object
    object.select_set(True)

    bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
    bpy.ops.object.convert(target='MESH')



class Dupper(bpy.types.Operator):
    bl_idname = "object.dupper"
    bl_label = "dupper"

    @classmethod
    def poll(cls, context):
        return True

    def execute(self, context):

        bpy.ops.wm.open_mainfile(filepath=str(FILE))

        object=bpy.data.objects["mball"]

        makedup(object)

        return {'FINISHED'}