old_contents: $(document).ready(function()
  {   
      $("#invite-form").on('submit', function()
      {   
          var inviteeEmail = $("#email").val();
          console.log(inviteeEmail)
  
          if (!inviteeEmail || !inviteeEmail.length) {
              alert('Please enter an email');
              return false;
          }
  
          $.ajax({
            type: "POST",
            url: "/",
            headers: {
              'X-CSRFToken': csrfToken,
              },
            data: { email: inviteeEmail},
            success: function(data) {
              handleResponse(data);
            }
          });
          return false;
      });        
  });
  
  function handleResponse(data) {
      if (data.status === 'fail') {
        $("#response-text").text(getUserFriendlyError(data.error));
      }
      $("#response-div").toggleClass('hidden');
  }
  
  function getUserFriendlyError(error){
    if(error === 'already_in_team'){
      return 'Already signed up! Click on "Sign in" below to get started';
    } else if(error === 'invalid_email'){
      return 'Thats an invalid email address. Please check again';
    } else if(error === 'already_invited'){
      return 'You have been invited already. Check your inbox!';
    } else if(error === 'invalid_auth'){
      return 'There seems to be some issues with the setup. Please contact the admin of this channel';
    } else{
      return error;
    }
  }
new_contents: $(document).ready(function()
  {   
      $("#invite-form").on('submit', function()
      {   
          var inviteeEmail = $("#email").val();
          console.log(inviteeEmail)
  
          if (!inviteeEmail || !inviteeEmail.length) {
              alert('Please enter an email');
              return false;
          }
  
          $.ajax({
            type: "POST",
            url: "/",
            headers: {
              'X-CSRFToken': csrfToken,
              },
            data: { email: inviteeEmail},
            success: function(data) {
              handleResponse(data);
            }
          });
          return false;
      });        
  });
  
  function handleResponse(data) {
      if (data.status === 'fail') {
        $("#response-text").text(getUserFriendlyError(data.error));
      }
      $("#response-div").removeClass('hidden');
  }
  
  function getUserFriendlyError(error){
    if(error === 'already_in_team'){
      return 'Already signed up! Click on "Sign in" below to get started';
    } else if(error === 'invalid_email'){
      return 'Thats an invalid email address. Please check again';
    } else if(error === 'already_invited'){
      return 'You have been invited already. Check your inbox!';
    } else if(error === 'invalid_auth'){
      return 'There seems to be some issues with the setup. Please contact the admin of this channel';
    } else{
      return error;
    }
  }
subject: Use `removeClass` instead of `toggle`