CKAN OperationalError

gistfile1.pytb

File '/usr/local/ckan/pyenv27_ckan2/lib/python2.7/site-packages/sqlalchemy/engine/default.py', line 331 in do_execute
  cursor.execute(statement, parameters)
OperationalError: (OperationalError) server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
 'SELECT system_info.id AS system_info_id, system_info.key AS system_info_key, system_info.value AS system_info_value, system_info.revision_id AS system_info_revision_id \nFROM system_info \nWHERE system_info.key = %(key_1)s \n LIMIT %(param_1)s' {'key_1': 'ckan.config_update', 'param_1': 1}