后台安装报错

[weizhixiangcoder]

[root@localhost niuniu_server]# npm install npm WARN [email protected] No repository field.

removed 3 packages in 1.127s found 0 vulnerabilities

[root@localhost niuniu_server]# node launch.js module.js:544 throw err; ^

Error: Cannot find module 'express' at Function.Module._resolveFilename (module.js:542:15) at Function.Module._load (module.js:472:25) at Module.require (module.js:585:17) at require (internal/module.js:11:18) at Object. (/root/niuniu_server/center_server/centerServer.js:3:17) at Module._compile (module.js:641:30) at Object.Module._extensions..js (module.js:652:10) at Module.load (module.js:560:32) at tryModuleLoad (module.js:503:12) at Function.Module._load (module.js:495:3)