CryptoWoo requires the PHP extensions for cURL, mCrypt and GMP to be enabled on your server.
Possible error messages:
'GMP extension seems not to be installed'
'mCrypt extension seems not to be installed'
'cURL extension seems not to be installed'
How to enable the required extensions on your shared hosting account
How to enable the required extensions with commandline access
1. Via Commandline:
sudo apt-get install libgmp-dev php7.0-gmp mcrypt curl php7.0-curl
2. Add the line below to the php.ini (e.g. /etc/php7.0/apache2/php.ini) [?]
3. Restart your webserver (e.g. Apache):
sudo service apache2 reload