Help! somethings wrong

When someone wants to write a comment, the following errors occur. What can be wrong?

Warning: fopen(/home/pidk/domains/popindekop.nl/public_html/home//wp-content/plugins/live/logs/log.txt): failed to open stream: Permission denied in /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php on line 65

Warning: fwrite(): supplied argument is not a valid stream resource in /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php on line 66

Warning: fclose(): supplied argument is not a valid stream resource in /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php on line 67

Warning: Cannot modify header information – headers already sent by (output started at /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php:65) in /home/pidk/domains/popindekop.nl/public_html/home/wp-comments-post.php on line 55

Warning: Cannot modify header information – headers already sent by (output started at /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php:65) in /home/pidk/domains/popindekop.nl/public_html/home/wp-comments-post.php on line 56

Warning: Cannot modify header information – headers already sent by (output started at /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php:65) in /home/pidk/domains/popindekop.nl/public_html/home/wp-comments-post.php on line 57

Warning: Cannot modify header information – headers already sent by (output started at /home/pidk/domains/popindekop.nl/public_html/home/wp-content/plugins/live/live.php:65) in /home/pidk/domains/popindekop.nl/public_html/home/wp-includes/pluggable-functions.php on line 272