I am installing packages for NODEJS/NPM and am receiving the following error, which, apparently, is not an error with the software, but with my MAC. Please help as this is interfering with my projects.Error: EPERM: operation not permitted, mkdir '/usr/loca'TypeError: Cannot read property 'get' of undefined at errorHandler (/usr/local/lib/node_modules/npm/lib/utils/error-handler.js:205:18) at /usr/local/lib/node_modules/npm/bin/npm-cli.js:83:20 at cb (/usr/local/lib/node_modules/npm/lib/npm.js:214:22) at /usr/local/lib/node_modules/npm/lib/npm.js:252:24 at /usr/local/lib/node_modules/npm/lib/config/core.js:81:7 at Array.forEach (<anonymous>) at /usr/local/lib/node_modules/npm/lib/config/core.js:80:13 at f (/usr/local/lib/node_modules/npm/node_modules/once/once.js:25:25) at afterExtras (/usr/local/lib/node_modules/npm/lib/config/core.js:178:20) at /usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53/usr/local/lib/node_modules/npm/lib/utils/error-handler.js:205 if (npm.config.get('json')) { ^