This is BibTeX, Version 0.99dThe top-level auxiliary file: main.aux
The style file: LHCb.bst
I couldn't open database file bib_main.bib.bib
---line 32 of file main.aux
 : \bibdata{bib_main.bib
 :                      }
I'm skipping whatever remains of this command
I found no database files---while reading file main.aux
Warning--I didn't find a database entry for "aaij2015measurement"
(There were 2 error messages)