运行AWS_IOT测试时出现错误“找不到模块~~”

Question

出现以下错误。请帮助。

Running pub/sub sample application...
module.js:549
    throw err;
    ^
Error: Cannot find module '/home/server1/AWSIOT/node_modules/aws-iot-device-sdk/examples/device-example.js'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:188:16)
    at bootstrap_node.js:609:3