お名前com のサーバー（レンタルサーバーRSプラン）で、拡張子htmlのままphpを動かしたい。

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

[Sun Apr 18 16:43:47.898276 2021] [cgi:error] [pid 357351] [client 180.34.70.77:0] AH01215: suexec policy violation: see suexec log for more details: /home/r1939859/public_html/sana-kashiwa.com/php.cgi
[Sun Apr 18 16:43:47.898395 2021] [cgi:error] [pid 357351] [client 180.34.70.77:0] End of script output before headers: php.cgi

document.addEventListener('touchstart', function() {}, {passive: true});
$(function(){
  $('a[href^=#]').click(function() {
    var position = 0;
    var href= $(this).attr("href");
    if(href.indexOf('#') >= 0 && $(href).size() && href != '' && href != '#'){
      var target = $(href);
      try{
        position = target.offset().top;
      }catch(e){
      }
    }
    var scrollY = document.documentElement.scrollTop || document.body.scrollTop;
    var speed = Math.ceil(Math.pow(Math.abs((position - scrollY)), 0.7));
    if(speed){
      $('body, html').animate({scrollTop:position}, speed, 'swing');
    }
    history.replaceState(null, '', location.pathname)
    return false;
  });
});