bibliography file style not picked up by texstudio

I downloaded the elsearticle-num.bst and copied it to the same file that contains my tex document. But while running, I am getting these messages:

This is BibTeX, Version 0.99d (MiKTeX 2.9.7000 64-bit)
The top-level auxiliary file: seminar report.aux
I couldn't open style file elsearticle-num.bst
---line 26 of file seminar report.aux
 : bibstyle{elsearticle-num
 :                          }
I'm skipping whatever remains of this command
I found no style file---while reading file seminar report.aux
(There were 2 error messages)

Process exited with error(s)

The .bst file is in the same folder, and the reference file (.bib) isnt loading.

Please help