I got this error most of the time while doing any task related to a particular frame when it tries to contact to any external server, for eg the plug-in server:

MyBB has experienced an internal SQL error and cannot continue.
SQL Error:
2013 - Lost connection to MySQL server during query
Query:
SELECT title,cache FROM mybb_datacache WHERE title='mailqueue'
While searching a lot, I found that it is a host related problem, my account is on stoli server, so are their any chances that it will be corrected, or it is a error from my side ?
I used softaculous to install MyBB.