Grunt not working.

[avaiskhatri]

Grunt showing error.

Running "watch" task
Waiting...
Waiting forever...
Started connect web server on http://localhost:8000
(node:1094) UnhandledPromiseRejectionWarning: Error: Exited with code 3
at ChildProcess. (/root/meme/node_modules/opn/index.js:83:13)
at Object.onceWrapper (events.js:286:20)
at ChildProcess.emit (events.js:198:13)
at maybeClose (internal/child_process.js:982:16)
at Socket.stream.socket.on (internal/child_process.js:389:11)
at Socket.emit (events.js:198:13)
at Pipe._handle.close (net.js:606:12)

(node:1094) UnhandledPromiseRejectionWarning: Unhandled promise rejection. T                  his error originated either by throwing inside of an async function without a ca                  tch block, or by rejecting a promise which was not handled with .catch(). (rejec                  tion id: 1)
(node:1094) [DEP0018] DeprecationWarning: Unhandled promise rejections are d                  eprecated. In the future, promise rejections that are not handled will terminate                   the Node.js process with a non-zero exit code.