While trying to check out I keep getting this error message:

( 2006 MySQL server has gone away
in:
[select customers_email_format from customers where customers_email_address= 'derrickhicks123######################']

2006 MySQL server has gone away
in
[select count(*) as total from sessions where sesskey = '8de4963043c109fdfbbe9793ae97c6ad'] )

Can someone tell me what this means and how to fix this.

Thank You
Derrick