Error while install npm packages

Not Found - PUT https://npm.pkg.github.com/:_authToken=********/-/user/org.couchdb.user:assang
npm ERR! 404
npm ERR! 404 ‘org.couchdb.user:assang’ is not in the npm registry.
npm ERR! 404 Your package name is not valid, because
npm ERR! 404 1. name can only contain URL-friendly characters