I solved it, thousand thanks to you. now it works as before. but there is another problem, if you can suggest me what I can do. the authors with names of more than 3 parts are not crawled, and authors containing ( ' , .Jr, II, III). example this authors:

Norie De La Cruz
Norm O'Neill
Norman L. Guinasso Jr.
Norris Milton II
Northrup Fowler III
Noor Asna Fazli Abdul Samad
N. S. S. S. N. Usha Devi
Niels H. M. Aan de Brugh
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