code returning this error

(node:14140) DeprecationWarning: Collection#find: pass a function instead
(node:14140) UnhandledPromiseRejectionWarning: DiscordAPIError: Unknown Channel
    at item.request.gen.end (C:\Users\david\Desktop\THE ALL IN ONE DISCORD BOT\node_modules\discord.js\src\client\rest\RequestHandlers\Sequential.js:79:15)
    at then (C:\Users\david\Desktop\THE ALL IN ONE DISCORD BOT\node_modules\snekfetch\src\index.js:215:21)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:14140) 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: 2)
(node:14140) [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.
(node:14140) UnhandledPromiseRejectionWarning: DiscordAPIError: Unknown Channel
    at item.request.gen.end (C:\Users\david\Desktop\THE ALL IN ONE DISCORD BOT\node_modules\discord.js\src\client\rest\RequestHandlers\Sequential.js:79:15)
    at then (C:\Users\david\Desktop\THE ALL IN ONE DISCORD BOT\node_modules\snekfetch\src\index.js:215:21)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:14140) 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: 4)