As I'm sure you realise, the Wrapper plugin uses an existing nc file as it's input. This file must be right for your machine becasue the plugin cannot make it right.
These codes are not handled by the plugin;
public static String [] invalidCodes= {"G2", "G3", "G02", "G03", "G81", "G82", "G83", "G84", "G85", "G86", "G87", "G88", "G89"};
Did you mean G02 and G03 ?