could not find cucumber plugin for protractor test - protractor

Question

i am brand new to protractor and did setup as per the instructions from the protractor website. When i try to run the protractor test with the a cucumber framework i always get "Error: Error: Cannot find module 'cucumber'". Any help on this? below are by configurations.
cucumber-conf.js
exports.config = {
seleniumAddress: 'http://localhost:4444/wd/hub',
capabilities: {
browserName:'chrome'
},
framework: 'custom',
frameworkPath: require.resolve('protractor-cucumber-framework'),
specs: [
'./cucumber/*.feature'
],
cucumberOpts: {
require: ['./cucumber/*.js'],
tags: [],
strict: true,
format: ["pretty"],
dryRun: false,
compiler: []
},
onPrepare: function () {
browser.manage().window().maximize();
}
};
when i run protractor cucumber-conf.js i get below error.
/opt/protractor_tests
➔ protractor cucumber-conf.js
(node:5681) DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.
[12:06:55] I/launcher - Running 1 instances of WebDriver
[12:06:55] I/hosted - Using the selenium server at http://localhost:4444/wd/hub
[12:06:57] E/launcher - Error: Error: Cannot find module 'cucumber'
at Function.Module._resolveFilename (module.js:472:15)
at Function.Module._load (module.js:420:25)
at Module.require (module.js:500:17)
at require (internal/module.js:20:19)
at Object.module.exports.load (/opt/protractor_tests/node_modules/protractor-cucumber-framework/lib/cucumberLoader.js:5:12)
at Object.<anonymous> (/opt/protractor_tests/node_modules/protractor-cucumber-framework/index.js:5:48)
at Module._compile (module.js:573:32)
at Object.Module._extensions..js (module.js:582:10)
at Module.load (module.js:490:32)
at tryModuleLoad (module.js:449:12)
[12:06:57] E/launcher - Process exited with error code 100