I downloaded a rig from a website. It has bones and two circles.When i export the model in .fbx, i can see the circles in the game.And i got these errors after than exporting :

The plug-in does not support the following objects' geometry type and will convert them to an editable mesh. Morph and skin deformations may be lost. If 'Enable in Viewport' is deactivated, closed shapes are capped and open shapes are converted to dummy objects with no edges or faces. If 'Enable in Viewport' is active, the Viewport settings are used for the mesh conversion: -Circle002 -Circle003

When 'Split per-vertex Normals' is activated, some vertices on exported geometries are duplicated so that the correct number of normals are defined. If you want to keep the original number of vertices with the geometry, disable this option. Note: Hard edges and smoothing groups are also lost.

Please help... Thanks