Partial is not defined

partial is not defined
    at eval (eval at <anonymous> (/home/anr/node_modules/ejs/lib/ejs.js:237:14), <anonymous>:29:165)
    at eval (eval at <anonymous> (/home/anr/node_modules/ejs/lib/ejs.js:237:14), <anonymous>:29:215)
    at /home/anr/node_modules/ejs/lib/ejs.js:250:15
    at Object.exports.render (/home/anr/node_modules/ejs/lib/ejs.js:288:13)
    at View.exports.renderFile [as engine] (/home/anr/node_modules/ejs/lib/ejs.js:318:20)
    at View.render (/home/anr/node_modules/express/lib/view.js:76:8)
    at Function.app.render (/home/anr/node_modules/express/lib/application.js:504:10)
    at ServerResponse.res.render (/home/anr/node_modules/express/lib/response.js:798:7)
    at app.post.res.send.status (/home/anr/Desktop/node js/mvc/ntwitter.js:17:7)
    at callbacks (/home/anr/node_modules/express/lib/router/index.js:164:37)