Why npm install will error ?

[ruralist-siyi]

npm ERR! path /Users/zhangsiyi/routine-demo/webpack-react-app/node_modules/_ajv@5.5.2@ajv/node_modules/fast-deep-equal
npm ERR! code ENOENT
npm ERR! errno -2
npm ERR! syscall access
npm ERR! enoent ENOENT: no such file or directory, access '/Users/zhangsiyi/routine-demo/webpack-react-app/node_modules/_ajv@5.5.2@ajv/node_modules/fast-deep-equal'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/zhangsiyi/.npm/_logs/2018-09-30T02_21_43_237Z-debug.log

[huruji]

try npm cache clean --force @ruralist-siyi

[ruralist-siyi]

try npm cache clean --force @ruralist-siyi

thanks.