Initialization Error

Array
(
    [callback] => Array
        (
            [0] => CRM_Core_Error
            [1] => simpleHandler
        )

    [code] => -14
    [message] => DB Error: no database selected
    [mode] => 16
    [debug_info] => SELECT  id  
 FROM civicrm_option_group 
 
 WHERE (  civicrm_option_group.name  = 'report_template' )  
 
 
 
 [nativecode=2006 ** MySQL server has gone away]
    [type] => DB_Error
    [user_info] => SELECT  id  
 FROM civicrm_option_group 
 
 WHERE (  civicrm_option_group.name  = 'report_template' )  
 
 
 
 [nativecode=2006 ** MySQL server has gone away]
    [to_string] => [db_error: message="DB Error: no database selected" code=-14 mode=callback callback=CRM_Core_Error::simpleHandler prefix="" info="SELECT  id  
 FROM civicrm_option_group 
 
 WHERE (  civicrm_option_group.name  = 'report_template' )  
 
 
 
 [nativecode=2006 ** MySQL server has gone away]"]
)