Hey when i click "Export ms3d" i get these errors i recorded--

Error 1- Mesh Line03 does not have a skin modifier, cannot export. If this mesh is not part of your model you can delete and try again
Error 2-Mesh Line01 has no modifiers, in particular, no skin modifier.
Error 3-Mesh Line04 has no modifiers, in particular, no skin modifier.
Error 4-Mesh Tube01 does not have a skin modifier, cannot export. If this mesh is not part of your model you can delete and try again

i could really use an explanation thanks