[Plugin: WP Super Cache] Error when enable it

Hi!, I have installed WP Super Cache and when I enable the plugin I get these errors in the header:

Warning: file(/home/…/public_html/…/wp-content/wp-cache-config.php) [function.file]: failed to open stream: No such file or directory in /home/…/public_html/…/wp-content/plugins/wp-super-cache/wp-cache.php on line 1963

Warning: Invalid argument supplied for foreach() in /home/…/public_html/…/wp-content/plugins/wp-super-cache/wp-cache.php on line 1964

Lines 1963 and 1964 are these:

$lines = file($wp_cache_config_file);
foreach($lines as $line) {

Any idea?

Thanks!