@PitaJ run: sudo chmod 777 .npm/source-map/ then npm install again: $ npm install npm WARN deprecated [email protected]: Please upgrade to 2.2.19 or higher npm WARN deprecated [email protected]: wrench.js is deprecated! You should check out fs-extra (https://github.com/jprichardson/node-fs-extra) for any operations you were using wrench for. Thanks for all the usage over the years. npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue npm WARN deprecated [email protected]: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue npm WARN deprecated [email protected]: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree. [email protected] node_modules/require_optional/node_modules/semver -> node_modules/semver [email protected] /Applications/XAMPP/xamppfiles/htdocs/NodeBB though still have warning, but installed succeed. Thanks very much! I will go for next steps.