Error with plugin

Warning: fopen(/index.php) [function.fopen]: failed to open stream: Permission denied in /www/snapblogger.com/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 842

Warning: fopen(/.htaccess) [function.fopen]: failed to open stream: Permission denied in /www/snapblogger.com/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 849