Pushing the same view controller instance more than once is not supported

i used the below line in three different methods

[viewController.navigationController pushViewController:newsDetailPrev flipStyle:style];

[viewController.navigationController pushViewController:newsDetailNext flipStyle:style];

[viewController.navigationController pushViewController:newsDetailcurrent flipStyle:style];

but it shows error.the error is Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Pushing the same view controller instance more than once is not supported.

can any one resolve my issue

thanks in advance