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mongoose报错：RangeError: Maximum call stack size exceeded

代码：var express = require('express');var app=express();//socket.io公式：var http = require('http').Server(app);var io = require('socket.io')(http);//session公式：var session = require('express-sessi

错误显示：Error: Cannot find module 'ejs'   at Function.Module._resolveFilename (module.js:325:15)   at Function.Module._load (module.js:276:25)   at Module.require (module.js:353:17)   at requir