Errors:

php -q ./NSXMon.php -H 10.6.253.253 -f “/usr/lib/nagios/plugins/NSXauthfile.cfg” -m “system” -a “mem-usage” -c “95” -C “” -O “” -s “” -n “”
PHP Notice: Undefined variable: mymempercent in /usr/lib/nagios/plugins/NSXMon.php on line 384
PHP Stack trace:
PHP 1. {main}() /usr/lib/nagios/plugins/NSXMon.php:0
PHP 2. main() /usr/lib/nagios/plugins/NSXMon.php:1177
PHP Notice: Undefined variable: mymempercent in /usr/lib/nagios/plugins/NSXMon.php on line 389
PHP Stack trace:
PHP 1. {main}() /usr/lib/nagios/plugins/NSXMon.php:0
PHP 2. main() /usr/lib/nagios/plugins/NSXMon.php:1177

How could I fix that ?