Get error when I use robots meta

Hi, I am using the “Robots Meta” by Joost De Valk

and i get this error in the plugging setting

Warning: fopen(/home1/fearthev/public_html/letsgetbacklinks/wp-content/cache/.htaccess) [function.fopen]: failed to open stream: No such file or directory in /home1/fearthev/public_html/letsgetbacklinks/wp-content/plugins/robots-meta/robots-meta.php on line 322

Warning: filesize() [function.filesize]: stat failed for /home1/fearthev/public_html/letsgetbacklinks/wp-content/cache/.htaccess in /home1/fearthev/public_html/letsgetbacklinks/wp-content/plugins/robots-meta/robots-meta.php on line 323

Warning: fread(): supplied argument is not a valid stream resource in /home1/fearthev/public_html/letsgetbacklinks/wp-content/plugins/robots-meta/robots-meta.php on line 323