Cannot find module 'copy-mocks' issue occurs while running ember server in localhost and server stops. Attached the error below

Cannot find module 'copy-mocks'
Error: Cannot find module 'copy-mocks'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:278:25)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/Users/me/github/cg/cd-project/Brocfile.js:11:8)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)