How to fix "Can't find training file" error?

Question

I get this error:

Error: Can't find training file, please try to specify it with the --source option

I thought it was a file path issue, so I added source and still got an error:

(node:36619) UnhandledPromiseRejectionWarning: Can't parse json file "/Users/Cos-Ibe/Futo_Chatbot/data/data.json"
SyntaxError: Unexpected token  in JSON at position 0
(Use `node --trace-warnings ...` to show where the warning was created)
(node:36619) 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(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:36619) [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.