Referencing error


I’m facing probelm with citation. I was using numbered style citation and just now when i tried to cite another paper, its giving error like this {Xi-Guang Han, 2009 #293} instead of ‘[40]’ numbered pattern and also does not link with bibliography. I tried to reopen everthing but the problem remains the same. Could any one help me with this situation?

Your suggestion is highly appreciated. Thank you for your time and response.