问输入npm install后报错？

报错信息：

npm ERR! code ETARGET

npm ERR! notarget No matching version found for wafer-node-sdk@^1.3.4

npm ERR! notarget In most cases you or one of your dependencies are requesting

npm ERR! notarget a package version that doesn't exist.

npm ERR! notarget

npm ERR! notarget It was specified as a dependency of 'koa-weapp-demo'

npm ERR! notarget

npm ERR! A complete log of this run can be found in:

npm ERR! /root/.npm/_logs/2018-05-04T11_25_22_190Z-debug.log

[root@VM_0_15_centos weapp]# npm install

npm ERR! code ETARGET

npm ERR! notarget No matching version found for wafer-node-sdk@^1.3.4

npm ERR! notarget In most cases you or one of your dependencies are requesting

npm ERR! notarget a package version that doesn't exist.

npm ERR! notarget

npm ERR! notarget It was specified as a dependency of 'koa-weapp-demo'

npm ERR! notarget

npm ERR! A complete log of this run can be found in:

npm ERR! /root/.npm/_logs/2018-05-04T11_25_47_770Z-debug.log