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One regrettable error appeared in Eq.(21) of our article [Chin.Phys.Lett.30(2013)100402].The correct one of the equation is as follows:f0=3/16π(5/256)3/8[f(e)]-3/8/(GMc)5/8Τ11/8(1+z)5/8.(21)One can estimate the frequency difference now replaced to be δf ≈ 10-11 Hz,which is two orders of magnitude lower than the frequency resolution of PTAs.Hence,we can ignore the evolution effects of the binary in OJ287 in this study.