osx - How to create a new instance of an NSDocument with NSDocumentController? -


i tried

[[nsdocumentcontroller shareddocumentcontroller] duplicatedocumentwithcontentsofurl:nil                                                                             copying:no                                                                         displayname:nil                                                                               error:null] ;

but not working. have error

typeforcontentsofurl:error: must overridden application support non-'file:' urls.

did try below:-

   [[nsdocumentcontroller shareddocumentcontroller]newdocument:self];

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