Install expressworks failed with npm

[caibf]

I install expressworks globally following this command:
npm i -g expressworks

I try many times but this error occurs again and again. I don't know how to slove it. Could you help me ?

npm ERR! Unexpected end of input at 1:20117
npm ERR! :"*"},"directories":{},"dist":{"shasum":"38f9579d308fbb6dde472eede55e
npm ERR!                                                                      ^

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/caibofan/.npm/_logs/2017-09-24T10_31_54_417Z-debug.log