Hummingbird creating Sucuri Monitor security alerts

I received four of these errors from my Sucuri monitor. Security warning in the URL: http://www.transfemme.com/404testpage4525d2fdc

Site error detected. Details: http://sucuri.net/malware/php-error-headers-already-sent?error.parse_error.1

Details on the four errors are listed below. How do I correct this so my Sucuri Monitor isn’t sending security alerts?

<b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/usr/www/users/wbreast2/Kristin/www.transfemme.com/wp-content/plugins/wp-hummingbird/core/modules/minify/class-jshrink-minifier.php</b> on line <b>283</b>

<b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/usr/www/users/wbreast2/Kristin/www.transfemme.com/wp-content/plugins/wp-hummingbird/core/modules/minify/class-jshrink-minifier.php</b> on line <b>283</b>

<b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/usr/www/users/wbreast2/Kristin/www.transfemme.com/wp-content/plugins/wp-hummingbird/core/modules/minify/class-jshrink-minifier.php</b> on line <b>283</b>

<b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/usr/www/users/wbreast2/Kristin/www.transfemme.com/wp-content/plugins/wp-hummingbird/core/modules/minify/class-jshrink-minifier.php</b> on line <b>283</b>

Thank you

Kristin