Error fetching zone data for mydomain.db's MX & not being able to reset zone file

[diego2x1]

I tried to change my email MX Entry today and I got this " Error fetching zone data for mydomain.db's MX "
Does anyone know how to fix it, otherwise can you change it from your side please?

I tried this
https://community.x10hosting.com/threads/error-fetching-zone-data-for-domain-com-dbs-mx.180375/

But its not being reset, its failing

http://imgur.com/izDmNpJ