Subscription class not found: Rails ActionCable

I am trying to add an instant messaging function to my Rails 7 app. I keep getting the following error:

Started GET "/cable" [WebSocket] for ::1 at 2023-04-25 03:28:15 +0100
Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
Subscription class not found: "ConversationsChannel"

I have this in app/channels/conversation_channel.rb:

class ConversationsChannel < ApplicationCable::Channel
 def subscribed
    conversation = Conversation.find(params[:conversation_id])
    stream_for conversation
  end
end

My div for displaying the conversation:

<div class="well w-full md:ml-5 flex-1 h-4/5" data-channel-subscribe="conversations" data-conversation-id="<%= @conversation.id %>">
  #rest of html
</div>

Javascript:

import consumer from "/channels/consumer";

  $(function() {
    $('[data-channel-subscribe="conversations"]').each(function(index, element) {
      var $element = $(element),
          conversation_id = $element.data('conversation-id'),
          messageTemplate = $('[data-role="message-template"]');

      consumer.subscriptions.create(
        {
          channel: "ConversationsChannel",
          conversation_id: conversation_id
        },
        {
          received: function(data) {

        if (data.sender_id === gon.current_user_id) {
          var ul = document.getElementById("list");
          var li = document.createElement("li");
          li.classList.add('me');
          li.appendChild(document.createTextNode(data.body));
          ul.appendChild(li);
        } else {
          var ul = document.getElementById("list");
          var li = document.createElement("li");
          li.classList.add('him');
          li.appendChild(document.createTextNode(data.body));
          ul.appendChild(li);
        }

        document.getElementById('body').value = ''
        var objDiv = document.getElementById("messages-scroll");
        $("#messages-scroll").scrollTop($("#messages-scroll")[0].scrollHeight);

      }
    }
  );
});


});

Am I missing something obvious? I can’t figure it out so any help would be appreciated. Thanks in advance.