warning: fopen(sites/all/modules/kaltura/kaltura.log)

Every time I try to do cron job ro try to connect to the Kaltura servers on my system I get the following message :

warning: fopen(sites/all/modules/kaltura/kaltura.log) [function.fopen]: failed to open stream: Permission denied in /home/beneblog/public_html/sites/all/modules/kaltura/kaltura_client/kaltura_logger.php on line 5.

kaltura.log is nonexistent in my directory !!
Whats going on ??

I made this file (kaltura.log) myself and gave it full permissions (777) (is this safe?).
Now all seems to work well and the system had written away some data to the file.

Can somebody confirm I did the right thing. And if not, what else I should do.