Need help encountered an error while exporting skeleton

Specified Skeleton "F_Skeleton’ do not match fbx imported skeleton. The error "Specified Skeleton “F_Skeleton’ do not match fbx imported skeleton. Cannot import animations with this skeleton” is displayed every time I try to export a mesh with a skeleton and animation, from blender 3D to unreal. And I do not know what to do with it, as the skeleton exported directly from one program to another may be different!?