Additional uncaught exception thrown while handling exception.

<h1>Additional uncaught exception thrown while handling exception.</h1><h2>Original</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT fc.*
FROM 
{field_config} fc
INNER JOIN {field_config_instance} fci ON fc.id = fci.field_id
WHERE  (fci.entity_type = :db_condition_placeholder_0) AND (fci.bundle = :db_condition_placeholder_1) AND (fc.active = :db_condition_placeholder_2) AND (fc.storage_active = :db_condition_placeholder_3) AND (fc.deleted = :db_condition_placeholder_4) ; Array
(
    [:db_condition_placeholder_0] => node
    [:db_condition_placeholder_1] => news
    [:db_condition_placeholder_2] => 1
    [:db_condition_placeholder_3] => 1
    [:db_condition_placeholder_4] => 0
)
 in field_read_fields() (line 372 of /mnt/panlin/modules/field/field.crud.inc).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT ff.*
FROM 
{filter_format} ff
WHERE  (status = :db_condition_placeholder_0) 
ORDER BY weight ASC; Array
(
    [:db_condition_placeholder_0] => 1
)
 in filter_formats() (line 434 of /mnt/panlin/modules/filter/filter.module).</p><hr />