TypeError [ERR_INVALID_ARG_TYPE]: The “path” argument must be of type string or an instance of Buffer or URL. Received undefined
at new ReadStream (node:internal/fs/streams:174:5)
at Object.createReadStream (node:fs:2921:10)
at /Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/src/helpers/upload/index.js:7:27
at new Promise ()
at saveFileToDisk (/Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/src/helpers/upload/index.js:4:12)
at /Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/src/routers/upload/index.js:21:23
at dispatch (/Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/node_modules/koa-compose/index.js:42:32)
at /Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/node_modules/@koa/router/lib/router.js:425:16
at dispatch (/Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/node_modules/koa-compose/index.js:42:32)
at /Users/qingyiliu/Desktop/projects/book-mgr/book-mgr-be/node_modules/koa-compose/index.js:34:12