say command error

C:\Users\Noah\Desktop\na>node index.js
.-----------------------.
| Command | Load status |
|---------|-------------|
| ping.js | yes         |
| say.js  | yes         |
'-----------------------'
I'm Now Online, My name is NoahsArk
(node:14332) UnhandledPromiseRejectionWarning: ReferenceError: Richembed is not defined
    at Client.client.on (C:\Users\Noah\Desktop\na\index.js:48:44)
    at Client.emit (events.js:198:13)
    at MessageCreateHandler.handle (C:\Users\Noah\Desktop\na\node_modules\discord.js\src\client\websocket\packets\handlers\MessageCreate.js:9:34)
    at WebSocketPacketManager.handle (C:\Users\Noah\Desktop\na\node_modules\discord.js\src\client\websocket\packets\WebSocketPacketManager.js:105:65)
    at WebSocketConnection.onPacket (C:\Users\Noah\Desktop\na\node_modules\discord.js\src\client\websocket\WebSocketConnection.js:333:35)
    at WebSocketConnection.onMessage (C:\Users\Noah\Desktop\na\node_modules\discord.js\src\client\websocket\WebSocketConnection.js:296:17)
    at WebSocket.onMessage (C:\Users\Noah\Desktop\na\node_modules\ws\lib\event-target.js:120:16)
    at WebSocket.emit (events.js:198:13)
    at Receiver.receiverOnMessage (C:\Users\Noah\Desktop\na\node_modules\ws\lib\websocket.js:789:20)
    at Receiver.emit (events.js:198:13)
(node:14332) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:14332) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.