fatal error at Mail Queue Manager

Sometimes you may face this issue WHM >> Email >> Mail Queue Manager >> at the last column if you click for details then you will get the error as 

[a fatal error or timeout occurred while processing this directive] [a fatal error or timeout occurred while processing this directive] [a fatal error or timeout occurred while processing this directive] [a fatal error or timeout occurred while processing this directive]undef error - Out of memory during "large" request for 33558528 bytes, total sbrk() is 205907968 bytes at /usr/local/cpanel/perl/Template/Stash.pm line 161.

In order to get this issue resolved you need to increase "Max cPanel process memory "  in Tweak Setting, increase the limit twice or thrice of the current limit.

Fatal error: Call to undefined function: date_default_timezone_set

If you face this issue then you will need to check php verison for that domain if its below 5.x then you will need to upgrade it to php5. The issue should get resolved