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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 www/_include.php:20 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Error: Call to undefined method SimpleSAML\Configuration::getOptionalBoolean()
Backtrace:
4 modules/saml/hooks/hook_sanitycheck.php:20 (saml_hook_sanitycheck)
3 lib/SimpleSAML/Module.php:576 (SimpleSAML\Module::callHooks)
2 modules/sanitycheck/www/index.php:11 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)