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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 www/_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: Database error: SQLSTATE[08004] [1040] Too many connections
Backtrace:
9 lib/SimpleSAML/Store/SQL.php:67 (SimpleSAML\Store\SQL::__construct)
8 lib/SimpleSAML/Store.php:52 (SimpleSAML\Store::getInstance)
7 lib/SimpleSAML/SessionHandler.php:138 (SimpleSAML\SessionHandler::createSessionHandler)
6 lib/SimpleSAML/SessionHandler.php:43 (SimpleSAML\SessionHandler::getSessionHandler)
5 lib/SimpleSAML/Session.php:354 (SimpleSAML\Session::getSession)
4 lib/SimpleSAML/Session.php:285 (SimpleSAML\Session::getSessionFromRequest)
3 lib/SimpleSAML/XHTML/IdPDisco.php:127 (SimpleSAML\XHTML\IdPDisco::__construct)
2 modules/saml/www/disco.php:7 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)