Random errors mails sent to admin after OJS upgrade to 3.0.2

After recently upgrading my website to 3.0.2, My OJS admin recieves mail :
Usage statistics file loader task - 593bbb86ab087 - Error as subject every few hours,Is there an error and how do i solve it?

Sincere apologies for double posting, Found similar topics on the forum.
I will try to solving via their method.