WP automatic upgrade plugin

Trying to use the WP automatic upgrade plugin, but get a load of error messages.

Can anyone help me out here – no idea what to do.

Thanks,

Graham

Warning: mkdir() [function.mkdir]: Permission denied in /home/fixed/public_html/wp-content/plugins/wordpress-automatic-upgrade/wordpress-automatic-upgrade.php on line 900

Warning: chmod() [function.chmod]: No such file or directory in /home/fixed/public_html/wp-content/plugins/wordpress-automatic-upgrade/wordpress-automatic-upgrade.php on line 901

Warning: fopen(/home/fixed/public_html/wpau-backup/index.html) [function.fopen]: failed to open stream: No such file or directory in /home/fixed/public_html/wp-content/plugins/wordpress-automatic-upgrade/wpau_helper.class.php on line 80
Cannot open file (/home/fixed/public_html/wpau-backup/index.html). Please create a empty /home/fixed/public_html/wpau-backup/index.html file manually
Warning: fopen(/home/fixed/public_html/wpau-backup/index.php) [function.fopen]: failed to open stream: No such file or directory in /home/fixed/public_html/wp-content/plugins/wordpress-automatic-upgrade/wpau_helper.class.php on line 90
Cannot open file (/home/fixed/public_html/wpau-backup/index.php). Please create a empty /home/fixed/public_html/wpau-backup/index.html file manually
Warning: fopen(/home/fixed/public_html/wpau-backup/index.html) [function.fopen]: failed to open stream: No such file or directory in /home/fixed/public_html/wp-content/plugins/wordpress-automatic-upgrade/wpau_helper.class.php on line 80
Cannot open file (/home/fixed/public_html/wpau-backup/index.html). Please create a empty /home/fixed/public_html/wpau-backup/index.html file manually
Warning: fopen(/home/fixed/public_html/wpau-backup/index.php) [function.fopen]: failed to open stream: No such file or directory in /home/fixed/public_html/wp-content/plugins/wordpress-automatic-upgrade/wpau_helper.class.php on line 90
Cannot open file (/home/fixed/public_html/wpau-backup/index.php). Please create a empty /home/fixed/public_html/wpau-backup/index.html file manuallyWe could not complete the upgrade please try again later, click here to check the logs.