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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 C:\inetpub\www_dpmb\identity\_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: Unable to find the SAML 2 binding used for this request.
Backtrace:
2 vendor\simplesamlphp\saml2\src\SAML2\Binding.php:107 (SAML2\Binding::getCurrentBinding)
1 modules\saml\lib\IdP\SAML2.php:356 (SimpleSAML\Module\saml\IdP\SAML2::receiveAuthnRequest)
0 C:\inetpub\www_dpmb\identity\saml2\idp\SSOService.php:26 (N/A)