PHP call_user_func_array() error

I am getting this error can not find this php file anywhere.

call_user_func_array() expects parameter 1 to be a valid callback, function 'ms_whitespace_fix' not found or invalid function name in /home/djglive/public_html/asaabforever/wp-includes/class-wp-hook.php on line 286

/* white space below menu fix */

/*function ms_whitespace_fix() {

if( ( is_category() == true ) || ( is_product_category() == true ) || ( is_single() == true ) ) { ?>
    <style type="text/css">
        .has-fixed-menu:not(.has-transparent-menu) .page-wrapper {
            padding-top: 0 !important;
        }
        @media all and ( max-width: 1150px ) {
            .has-fixed-menu:not(.has-transparent-menu) .page-wrapper {
                margin-top: -6px;
            }
        }
    </style>
<?php }

}*/