I can´t login in after installing wp-rocket plugin

Hi,

I´ve just installed the wp-rocket plugin in webps.es and now I cant log in wordpress. its shows this: "Sorry you do not have permission to access this page"
I've looked at the log file and shows this:
[18-Feb-2017 20:37:54 UTC] PHP Notice: Use of undefined constant LOGGED_IN_COOKIE - assumed 'LOGGED_IN_COOKIE' in /home/juann428/public_html/wp-includes/user.php on line 335
[18-Feb-2017 20:37:54 UTC] PHP Notice: Use of undefined constant AUTH_COOKIE - assumed 'AUTH_COOKIE' in /public_html/wp-includes/pluggable.php on line 756
[18-Feb-2017 20:37:57 UTC] PHP Notice: Use of undefined constant AUTH_COOKIE - assumed 'AUTH_COOKIE' in/public_html/wp-includes/pluggable.php on line 756

Any idea?

Many Thanks.