500 Internal server error

Exception: Could not connect to database: Too many connections in /www/www.piaggioaero.com/ROOT/yep-lib/sca/sca.php:2457
Stack trace:
#0 /www/www.piaggioaero.com/ROOT/yep-lib/sca/sca.php(2360): SCA_DBSession->__getConnection()
#1 /www/www.piaggioaero.com/ROOT/yep-lib/sca/sca.php(1649): SCA_DBSession->executeRead(Object(SCA_SqlStatement), 0, 1, 0)
#2 /www/www.piaggioaero.com/ROOT/yep-lib/sca/sca.php(808): SCA_Persistence->findEntitiesByQuery(Object(SCA_Query))
#3 /www/www.piaggioaero.com/ROOT/yep-lib/yep-model.php(1319): SCA->findEntities(Object(SCA_Query))
#4 /www/www.piaggioaero.com/ROOT/yep-lib/yep.php(790): YEP_PageManager->getPageAndEntityByUri('en/corporate/me...')
#5 /www/www.piaggioaero.com/ROOT/yep-lib/yep.php(486): YEP_bootstrap::dispatchSite()
#6 /www/www.piaggioaero.com/ROOT/yep-lib/yep.php(403): YEP_bootstrap::dispatch()
#7 /www/www.piaggioaero.com/ROOT/yep-lib/yep.php(1626): YEP_bootstrap::bootstrap()
#8 /www/www.piaggioaero.com/ROOT/index.php(3): require_once('/www/www.piaggi...')
#9 {main}