The directory is not writable by the Web process : XXXXXXXX
1) Open Your SSH ( For Example : PuTTY ).
2) Write This Commands :
cd /var/www/html
a2enmod rewrite
chown www-data.www-data assets
chown -R www-data.www-data protected/config
chown -R www-data.www-data protected/modules
chown -R www-data.www-data protected/runtime
chown -R www-data.www-data uploads
chmod +x protected/yii.bat
cp protected/humhub/modules/directory/controllers/DirectoryController.php protected/humhub/modules/directory/controllers/DirectoryController.php.bak
