Error In Logs

Hi, I updated the plugin but W3TC is still not agreeing with the plugin:

[Wed Apr 26 14:31:20.800949 2017] [:error] [pid 11257] [client 69.63.163.14:60469] PHP Warning: session_start(): Cannot send session cookie – headers already sent by (output started at /web/sites/#######/#######.com/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php:339) in /web/sites/#######/#######.com/wp-content/plugins/wp-limit-login-attempts/wp-limit-login-attempts.php on line 67, referer: https://www.google.com/

[Wed Apr 26 14:31:20.801308 2017] [:error] [pid 11257] [client 69.63.163.14:60469] PHP Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /web/sites/#######/#######.com/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php:339) in /web/sites/#######/#######.com/wp-content/plugins/wp-limit-login-attempts/wp-limit-login-attempts.php on line 67, referer: https://www.google.com/

[Wed Apr 26 14:32:13.106280 2017] [:error] [pid 11423] [client 104.129.194.74:24827] PHP Warning: session_start(): Cannot send session cookie – headers already sent by (output started at /web/sites/#######/#######.com/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php:339) in /web/sites/#######/#######.com/wp-content/plugins/wp-limit-login-attempts/wp-limit-login-attempts.php on line 67, referer: http://m.facebook.com

[Wed Apr 26 14:32:13.106447 2017] [:error] [pid 11423] [client 104.129.194.74:24827] PHP Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /web/sites/#######/#######.com/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php:339) in /web/sites/#######/#######.com/wp-content/plugins/wp-limit-login-attempts/wp-limit-login-attempts.php on line 67, referer: http://m.facebook.com