Plugin Undefined

[ghost]

node app.js

node.js:134
throw e; // process.nextTick error, or 'error' event on first tick
^
ReferenceError: Plugin is not defined
at Object. (/home/jennifer/node_modules/express/projects/dulynoted/realie/vendor/express/lib/express/plugins/hooks.js:34:1)
at Module._compile (module.js:402:26)
at Object..js (module.js:408:10)
at Module.load (module.js:334:31)
at Function._load (module.js:293:12)
at require (module.js:346:19)
at Object. (/home/jennifer/node_modules/express/projects/dulynoted/realie/vendor/express/lib/express/plugins.js:4:22)
at Module._compile (module.js:402:26)
at Object..js (module.js:408:10)
at Module.load (module.js:334:31)