Error on backup file_put_contents(/var/log/asterisk/freepbx.log): failed to open stream

[justin smith]

When I run a backup i get:

Saving Backup 1...done!
PHP Warning: file_put_contents(/var/log/asterisk/freepbx.log): failed to open stream: Permission denied in /var/www/html/admin/libraries/utility.functions.php on line 112
Intializing Backup 1
Backup Lock acquired!
Running pre-backup hooks...
Adding items...
Bulding manifest...
PHP Warning: file_put_contents(/var/log/asterisk/freepbx.log): failed to open stream: Permission denied in /var/www/html/admin/libraries/utility.functions.php on line 112
Creating backup...
Storing backup...
Running post-backup hooks...
Backup successfully completed!

the .tgz file seems fine, however.