Actually had my command line off :headbang: so didn't see an error, but this is what i get:

// Error: polyToSubdiv1 (Poly To Subdiv Node): One or more vertices is nonmanifold.
// Nonmanifold geometry cannot be converted to a subdivision surface.
// To clean up nonmanifold vertices, use Polygons->Cleanup with the nonmanifold option. //
// Error: Command polyToSubdiv failed. Open Script Editor for details. //

Know when i select the object and go to Polygons--->Cleanup, reset settings and then turned 'Nonmanifold Geometry' on and kept the second choice on 'Normals and Geometry' when i click apply i don't get an error or something so i assume it works but when i then try to convert it it gave the same error