Web application could not be started

[gianghungtien]

I have this problem when install on vps, please help me!!!

`internal/modules/cjs/loader.js:626 throw err; ^

Error: Cannot find module 'express' Require stack:

• /var/www/vhosts/pay.approho.co.uk/httpdocs/app.js
• /usr/share/passenger/helper-scripts/node-loader.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:623:15) at Function.Module._load (internal/modules/cjs/loader.js:527:27) at Module.require (internal/modules/cjs/loader.js:681:19) at Module.require (/usr/share/passenger/helper-scripts/node-loader.js:80:25) at require (internal/modules/cjs/helpers.js:16:16) at Object. (/var/www/vhosts/pay.approho.co.uk/httpdocs/app.js:4:17) at Module._compile (internal/modules/cjs/loader.js:774:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:785:10) at Module.load (internal/modules/cjs/loader.js:641:32) at Function.Module._load (internal/modules/cjs/loader.js:556:12) { code: 'MODULE_NOT_FOUND', requireStack: [ '/var/www/vhosts/pay.approho.co.uk/httpdocs/app.js', '/usr/share/passenger/helper-scripts/node-loader.js' ] }`

My website is https://pay.approho.co.uk