include_once error notice when running cronjob

Hi,

I am running a cronjob which sends emails automatically, so it doesn’t do anything with Mobile Connector.
However, I getting constantly a notice like this:
PHP Warning: include_once(): https:// wrapper is disabled in the server configuration by allow_url_include=0 in MYPATH/wp-content/plugins/mobile-assistant-connector/mobassistantconnector.php on line 35 PHP Warning: include_once(https://MYDOMAIN.de/wp-admin/includes/plugin.php): failed to open stream: no suitable wrapper could be found in MYPATH/wp-content/plugins/mobile-assistant-connector/mobassistantconnector.php on line 35 PHP Warning: include_once(): Failed opening 'https://MYDOMAIN.de/wp-admin/includes/plugin.php' for inclusion (include_path='.:') in MYPATH/wp-content/plugins/mobile-assistant-connector/mobassistantconnector.php on line 35

Googling this error message leads to this page:
https://stackoverflow.com/questions/23285503/warning-require-once-http-wrapper-is-disabled-in-the-server-configuration

Can you please fix that?

Thanks in advance!