CSV making error

Hello,
thanks for awesome plugin. I am having an issue when trying to make a csv file. Looks like this:

“Warning: fopen(/www/doc/www.datascript-elearning.cz/www/wp-content/plugins/lbak-user-tracking/csv/lbakut5rows050611095615.csv) [function.fopen]: failed to open stream: Permission denied in /www/doc/www.datascript-elearning.cz/www/wp-content/plugins/lbak-user-tracking/php_includes/main.php on line 163
Could not create .csv file. Please ensure that you have write permission on your server in the csv directory of this plugin.”

Have any idea how this could be solved??? thanks in advance