bae 404错误肿么办

Error: Cannot find module 'mongoose' at Function.Module._resolveFilename (module.js:375:15) at Function.Module._load (module.js:318:25) at Module.require (module.js:398:17) at require (instance1/nodejs/runtime/src/sandbox/modules/module.js:42:15) at Object. (instance1/nodejs/nodejsd.duapp.com/app/dao/todoDao.js:2:16) at Module.wrappedCompile [as _compile] (instance1/nodejs/runtime/src/sandbox/modules/module.js:118:25) at Object.Module._extensions..js (module.js:502:10) at Module.load (module.js:392:32) at Function.Module._load (module.js:350:12) at Module.require (module.js:398:17)