npm run build error

[yishanchuan]

error stack mesages is in the following:

oot@ck-APCS:/home/ck/Downloads/RDFViz-master# npm run build

> [email protected] build /home/ck/Downloads/RDFViz-master
> mkdir -p ./build && cp ./src/index.html ./build/ && webpack -p --config webpack.production.config.js

sh: 1: webpack: Permission denied
npm ERR! code ELIFECYCLE
npm ERR! errno 126
npm ERR! [email protected] build: `mkdir -p ./build && cp ./src/index.html ./build/ && webpack -p --config webpack.production.config.js`
npm ERR! Exit status 126
npm ERR! 
npm ERR! Failed at the [email protected] build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2020-10-11T03_43_11_972Z-debug.log