I am getting this error message in the chat. I have a custom trigger set up using the following code, is there something I am missing? 
Code:
//Open the chatbot window as soon as the page finishes loading
window.addEventListener("load", function() {
  //Open the chatbot window before triggering the chatbot greeting
  window.botpressWebChat.sendEvent({ type: "show" });
  //Trigger the chatbot initial greeting, but give it some time after the "show" event to load first
  //TODO: Detect when the bot is ready in a tight loop to improve reliability and load speed
  setTimeout(function() {
    window.botpressWebChat.sendPayload({
      type: "trigger",
      type: "CONVERSATION_START",
      payload: {
      }
    });
  }, 5000);
}, 10000);