Bibtex errors and warnings

/tmp/yossiv.bib, line 1, warning: overriding existing definition of macro "comment1"
/tmp/yossiv.bib, line 2, warning: overriding existing definition of macro "prl"
/tmp/yossiv.bib, line 3, warning: overriding existing definition of macro "pra"
/tmp/yossiv.bib, line 4, warning: overriding existing definition of macro "pnmrs"
/tmp/yossiv.bib, line 5, warning: overriding existing definition of macro "ijqi"
/tmp/yossiv.bib, line 6, warning: overriding existing definition of macro "jmr"
/tmp/yossiv.bib, line 7, warning: overriding existing definition of macro "pnas"
/tmp/yossiv.bib, line 8, warning: overriding existing definition of macro "cpl"
/tmp/yossiv.bib, line 9, warning: overriding existing definition of macro "prsla"
/tmp/yossiv.bib, line 10, warning: overriding existing definition of macro "mrc"
/tmp/yossiv.bib, line 11, warning: overriding existing definition of macro "sicomp"
invalid token near line 115 (text was ''')
/tmp/yossiv.bib, line 119, warning: 55 characters of junk seen at toplevel
/tmp/yossiv.bib, line 115, warning: undefined macro "``arXiv:1411.4641"
/tmp/yossiv.bib, line 140, warning: possible runaway string started at line 139