Trouble with Feeds Import CSV on Localhost
In the case where you manually upload the file and then map to it, try public://feeds/bsif.csv
In the case where you try to upload using your browser, it should be working fine.  It could be that you're unable to upload files in general, not just with the feeds import module.
Check your server's access to upload to /sites/default/files... it could be that only your account has access to place the file there.  Also, Apache/PHP uses a tmp directory for file uploads, so it will need access there as well.