Problem when I run from backend-api from terminal in VSC the commad npm run start #10

Aftter some seconds when I run the command
npm run start stops and displays the following error:

(node:20824) UnhandledPromiseRejectionWarning: MongoServerSelectionError: connect ETIMEDOUT 3.210.115.71:27017
at Timeout._onTimeout (F:\Java-Jsf-1\tutorial-react\React-For-the-Rest-Of-Us\backend-api\node_modules\mongodb\lib\sdam\topology.js:292:38)
at listOnTimeout (internal/timers.js:557:17)
at processTimers (internal/timers.js:500:7)
(Use node --trace-warnings ... to show where the warning was created)
(node:20824) 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:20824) [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.
P.S.This happened in section 4/28.