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Additional uncaught exception thrown while handling exception.
Original

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT s.lid, t.translation, s.version FROM {locales_source} s LEFT JOIN {locales_target} t ON s.lid = t.lid AND t.language = :language WHERE s.source = :source AND s.context = :context AND s.textgroup = 'default'; Array ( [:language] => de [:source] => Settings for logging and alerts modules. Various modules can route Drupal's system events to different destinations, such as syslog, database, email, etc. [:context] => ) in locale() (line 720 of C:\xampp\htdocs\drupal7\modules\locale\locale.module).

Additional

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT s.lid, t.translation, s.version FROM {locales_source} s LEFT JOIN {locales_target} t ON s.lid = t.lid AND t.language = :language WHERE s.source = :source AND s.context = :context AND s.textgroup = 'default'; Array ( [:language] => de [:source] => The text to display in the title bar of a visitor's web browser when they view this page. This meta tag may also be used as the title of the page when a visitor bookmarks or favorites this page. [:context] => ) in locale() (line 720 of C:\xampp\htdocs\drupal7\modules\locale\locale.module).

Uncaught exception thrown in session handler.

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT 1 AS expression FROM {sessions} sessions WHERE ( (sid = :db_condition_placeholder_0) AND (ssid = :db_condition_placeholder_1) ); Array ( [:db_condition_placeholder_0] => NrTB3aog_yLF9fQSTEk4gOt4NANNEQqafSnXqFVgr-o [:db_condition_placeholder_1] => ) in _drupal_session_write() (line 209 of C:\xampp\htdocs\drupal7\includes\session.inc).

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000]: General error: 2006 MySQL server has gone away' in C:\xampp\htdocs\drupal7\includes\database\database.inc:2171 Stack trace: #0 C:\xampp\htdocs\drupal7\includes\database\database.inc(2171): PDOStatement->execute(Array) #1 C:\xampp\htdocs\drupal7\includes\database\database.inc(683): DatabaseStatementBase->execute(Array, Array) #2 C:\xampp\htdocs\drupal7\includes\database\database.inc(2350): DatabaseConnection->query('SELECT expire, ...', Array, Array) #3 C:\xampp\htdocs\drupal7\includes\lock.inc(167): db_query('SELECT expire, ...', Array) #4 C:\xampp\htdocs\drupal7\includes\lock.inc(146): lock_may_be_available('theme_registry:...') #5 C:\xampp\htdocs\drupal7\includes\theme.inc(449): lock_acquire('theme_registry:...') #6 C:\xampp\htdocs\drupal7\includes\bootstrap.inc(446): ThemeRegistry->set(Array) #7 [internal function]: DrupalCacheArray->__destruct() #8 {main} thrown in C:\xampp\htdocs\drupal7\includes\database\database.inc on line 2171