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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 www/_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: Invalid <username>:<password> for authentication source example-userpass: admin
Backtrace:
7 modules/exampleauth/lib/Auth/Source/UserPass.php:57 (SimpleSAML\Module\exampleauth\Auth\Source\UserPass::__construct)
6 lib/SimpleSAML/Auth/Source.php:336 (SimpleSAML\Auth\Source::parseAuthSource)
5 lib/SimpleSAML/Auth/Source.php:381 (SimpleSAML\Auth\Source::getById)
4 lib/SimpleSAML/Auth/Simple.php:68 (SimpleSAML\Auth\Simple::getAuthSource)
3 lib/SimpleSAML/Auth/Simple.php:168 (SimpleSAML\Auth\Simple::login)
2 modules/core/www/authenticate.php:38 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)