- building for production...E:touchalife_web_appclientnode_moduleslast-call-webpack-pluginsrcindex.js:170
    compiler.hooks.compilation.tap(
                   ^

TypeError: Cannot read property 'compilation' of undefined
    at OptimizeCssAssetsWebpackPlugin.apply (E:touchalife_web_appclientnode_moduleslast-call-webpack-pluginsrcindex.js:170:20)
    at Compiler.apply (E:touchalife_web_appclientnode_modulestapablelibTapable.js:375:16)
    at webpack (E:touchalife_web_appclientnode_moduleswebpacklibwebpack.js:33:19)
    at err (E:touchalife_web_appclientbuildbuild.js:19:3)
    at next (E:touchalife_web_appclientnode_modulesrimrafrimraf.js:75:7)
    at CB (E:touchalife_web_appclientnode_modulesrimrafrimraf.js:111:9)
    at E:touchalife_web_appclientnode_modulesrimrafrimraf.js:137:14
    at FSReqWrap.oncomplete (fs.js:153:21)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! client@1.0.0 build: `node build/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the client@1.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:UsersSrikanthLavudiaAppDataRoamingnpm-cache_logs2019-08-18T14_12_21_630Z-debug.log

{
  "name": "client",
  "version": "1.0.0",
  "description": "A Vue.js project",
  "author": "",
  "private": true,
  "scripts": {
    "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
    "start": "npm run dev",
    "lint": "eslint --ext .js,.vue src",
    "build": "node build/build.js"
  },
  "dependencies": {
    "@smartweb/vue-flash-message": "^0.4.1",
    "axios": "^0.18.1",
    "firebase": "^6.3.1",
    "vue": "^2.5.2",
    "vue-cookies": "^1.5.13",
    "vue-router": "^3.0.6",
    "vuetify": "^1.5.13",
    "vuex": "^3.1.0"
  },
  "devDependencies": {
    "autoprefixer": "^7.1.2",
    "babel-core": "^6.22.1",
    "babel-eslint": "^8.2.1",
    "babel-helper-vue-jsx-merge-props": "^2.0.3",
    "babel-loader": "^7.1.1",
    "babel-plugin-syntax-jsx": "^6.18.0",
    "babel-plugin-transform-runtime": "^6.22.0",
    "babel-plugin-transform-vue-jsx": "^3.5.0",
    "babel-preset-env": "^1.3.2",
    "babel-preset-stage-2": "^6.22.0",
    "chalk": "^2.0.1",
    "copy-webpack-plugin": "^4.0.1",
    "css-loader": "^2.1.1",
    "eslint": "^4.15.0",
    "eslint-config-standard": "^10.2.1",
    "eslint-friendly-formatter": "^3.0.0",
    "eslint-loader": "^1.7.1",
    "eslint-plugin-import": "^2.7.0",
    "eslint-plugin-node": "^5.2.0",
    "eslint-plugin-promise": "^3.4.0",
    "eslint-plugin-standard": "^3.0.1",
    "eslint-plugin-vue": "^4.0.0",
    "extract-text-webpack-plugin": "^3.0.0",
    "file-loader": "^1.1.4",
    "friendly-errors-webpack-plugin": "^1.6.1",
    "html-webpack-plugin": "^2.30.1",
    "node-notifier": "^5.1.2",
    "optimize-css-assets-webpack-plugin": "^5.0.1",
    "ora": "^1.2.0",
    "portfinder": "^1.0.13",
    "postcss-import": "^11.0.0",
    "postcss-loader": "^2.0.8",
    "postcss-url": "^7.2.1",
    "rimraf": "^2.6.0",
    "semver": "^5.3.0",
    "shelljs": "^0.7.6",
    "uglifyjs-webpack-plugin": "^1.1.1",
    "url-loader": "^1.1.2",
    "vue-loader": "^13.3.0",
    "vue-style-loader": "^3.0.1",
    "vue-template-compiler": "^2.5.2",
    "webpack": "^3.6.0",
    "webpack-bundle-analyzer": "^3.3.2",
    "webpack-dev-server": "^2.9.1",
    "webpack-merge": "^4.1.0"
  },
  "engines": {
    "node": ">= 6.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}