[Plugin: WP Super Cache] Plugin not working

The plugin is not working after installation. Here is an extract from the debugging log file. Any help/tips to solve this would be much appreciated! Thanks very much

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10:17:44 /insights/wp-cron.php?check=0d66a00d43ff3535380c68cbeebbfb79 In WP Cache Phase 2
10:17:44 /insights/wp-cron.php?check=0d66a00d43ff3535380c68cbeebbfb79 Setting up WordPress actions
10:17:44 /insights/wp-cron.php?check=0d66a00d43ff3535380c68cbeebbfb79 Supercache caching disabled. Only using wp-cache. Non empty GET request.
10:17:44 /insights/wp-cron.php?check=0d66a00d43ff3535380c68cbeebbfb79 URI rejected. Not Caching
10:17:45 /insights/index.php?ak_action=idptt_css_admin Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /insights/?ak_action=akpc_css Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /insights/index.php?ak_action=idptt_js_admin Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /insights/?ak_action=akpc_css supercache dir: /home/sandbox/public_html/insights/wp-content/cache/supercache/www.sandboxadvisors.com/insights/
10:17:45 /insights/index.php?ak_action=idptt_css_admin supercache dir: /home/sandbox/public_html/insights/wp-content/cache/supercache/www.sandboxadvisors.com/insights/
10:17:45 /insights/index.php?ak_action=idptt_js_admin supercache dir: /home/sandbox/public_html/insights/wp-content/cache/supercache/www.sandboxadvisors.com/insights/
10:17:45 /robots.txt Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /insights/index.php?ak_action=idptt_css_admin Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /insights/index.php?ak_action=idptt_js_admin Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /insights/?ak_action=akpc_css Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /robots.txt In WP Cache Phase 2
10:17:45 /insights/index.php?ak_action=idptt_css_admin No wp-cache file exists. Must generate a new one.
10:17:45 /insights/index.php?ak_action=idptt_js_admin No wp-cache file exists. Must generate a new one.
10:17:45 /insights/?ak_action=akpc_css No wp-cache file exists. Must generate a new one.
10:17:45 /robots.txt Setting up WordPress actions
10:17:45 /robots.txt Created output buffer
10:17:45 /robots.txt Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /robots.txt Output buffer callback
10:17:45 /robots.txt robots.txt detected. Not caching.
10:17:45 /robots.txt Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /robots.txt supercache dir: /home/sandbox/public_html/insights/wp-content/cache/supercache/www.sandboxadvisors.com/robots.txt/
10:17:45 /robots.txt Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:45 /robots.txt No wp-cache file exists. Must generate a new one.
10:17:46 /insights/?ak_action=akpc_css Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:46 /insights/?ak_action=akpc_css In WP Cache Phase 2
10:17:46 /insights/?ak_action=akpc_css Setting up WordPress actions
10:17:46 /insights/?ak_action=akpc_css Supercache caching disabled. Only using wp-cache. Non empty GET request.
10:17:46 /insights/?ak_action=akpc_css Created output buffer
10:17:46 /insights/?ak_action=akpc_css Output buffer callback
10:17:46 /insights/?ak_action=akpc_css No closing html tag. Not caching.
10:17:46 /robots.txt Cookie detected: wordpress_logged_in_6a5bee710aad21313b2e56f9c4505b77
10:17:47 /robots.txt In WP Cache Phase 2