! LaTeX Error: File `journal_names.sty' not found.
l.13 usepackage
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The log also as follows
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Package: natbib 2010/09/13 8.31b (PWD, AO)


Package natbib Warning: The `cite' package should not be used
(natbib)                with natbib. Use option `sort' instead.

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LaTeX Info: Redefining cite on input line 694.
LaTeX Info: Redefining citenum on input line 708.
c@NAT@ctr=count101
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! LaTeX Error: File `journal_names.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

Enter file name:
./main.tex:13: Emergency stop.
<read *>

l.13 usepackage
                {graphicx}^^M
Here is how much of TeX's memory you used:
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 1141 hyphenation exceptions out of 8191
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./main.tex:13:  ==> Fatal error occurred, no output PDF file produced!