Error 1. The “extra.asset-installer-paths” option is deprecated, use the “config.fxp-asset.installer-paths” option Update composer.json by removing asset-installer-paths and add fxp-assets { … “extra”: { “yii\\composer\\Installer::postCreateProject”: { “setPermission”: [ { “runtime”: “0777”, “web/assets”: “0777”, “yii”: “0755” } ], “generateCookieValidationKey”: [ “config/web.php” ] } }, “fxp-asset”: { “installer-paths”: { “npm-asset-library”: “vendor/npm”, “bower-asset-library”: “vendor/bower” } } … } Error…