NPM package error - Githubissues

when i install this i get following error

 npm install vuex-router-sync
npm ERR! Unexpected end of JSON input while parsing near '...ab067711142e","tarbal'

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Namila\AppData\Roaming\npm-cache\_logs\2018-08-20T13_58_42_097Z-debug.log

here is the log file;

0 info it worked if it ends with ok 1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe', 1 verbose cli 'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js', 1 verbose cli 'install', 1 verbose cli 'vuex-router-sync' ] 2 info using npm@5.6.0 3 info using node@v9.6.1 4 verbose npm-session 0aee25ed15cac44c 5 silly install loadCurrentTree 6 silly install readLocalPackageData 7 http fetch GET 304 https://registry.npmjs.org/vuex-router-sync 608ms (from cache) 8 silly fetchPackageMetaData error for vuex-router-sync@latest Unexpected end of JSON input while parsing near '...ab067711142e","tarbal' 9 verbose stack SyntaxError: Unexpected end of JSON input while parsing near '...ab067711142e","tarbal' 9 verbose stack at JSON.parse (<anonymous>) 9 verbose stack at parseJson (C:\Program Files\nodejs\node_modules\npm\node_modules\pacote\node_modules\make-fetch-happen\node_modules\node-fetch-npm\node_modules\json-parse-better-errors\index.js:7:17) 9 verbose stack at consumeBody.call.then.buffer (C:\Program Files\nodejs\node_modules\npm\node_modules\pacote\node_modules\make-fetch-happen\node_modules\node-fetch-npm\src\body.js:96:50) 9 verbose stack at <anonymous> 9 verbose stack at process._tickCallback (internal/process/next_tick.js:160:7) 10 verbose cwd D:\UoP\Programming\Project\Kichibichiya-backend 11 verbose Windows_NT 10.0.17134 12 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "vuex-router-sync" 13 verbose node v9.6.1 14 verbose npm v5.6.0 15 error Unexpected end of JSON input while parsing near '...ab067711142e","tarbal' 16 verbose exit [ 1, true ]

my package.json file ; "dependencies": { "axios": "^0.18.0", "vue": "^2.5.2", "vue-router": "^3.0.1", "vuetify": "^1.1.13", "vuex": "^3.0.1", "vuex-persist": "^1.4.3", "vuex-router-sync": "^5.0.0" },

vuejs / vuex-router-sync

NPM package error #86