2 small plesk issues: Configure Plesk ip6 support / roundcube calendar not working

I have two small issues with my plesk server that need to be resolved: 1. I had ip6 disabled on my server a while ago. Now I need it enabled because a lot of mobile networks are using ip6. None of my websites on my plesk server are showing up on mobile phones. I need these sites to work on mobile phones. Configure the server and plesk so they work. 2. I have roundcube calandar installed. When creating a calendar event and saving, I get the following error: Server Error! (Internal Server Error) and no invite is sent out to event participants. I need this server error corrected and the calendar to invite event participants as it should. I will award this immediately if the price is right and need this completed immediately. CentOS 6.6 Plesk: 12.5.30 Update #53