We getting error like undefined

Hi all I Installed this but we getting error like “undefined” each page and popup. If you have any idea How to remove it please help me.

Hi there,

What is your Server/PHP/MySQL setup? Have you set the following recommended permissions:

sudo chown -R www-data:www-data .

sudo chmod -R 755 .

sudo chmod -R 775 cache custom modules themes data upload config_override.php

Thanks,

Will.