Error in the SAML EJB (&1): &2&3&4

What causes this issue?

An error occurred during processing within the EJB BC_SEC_SAML_SERVICE
Bean (application tc~sec~saml~app) on the J2EE Engine of RFC destination
&V1&.
The message text of the J2EE Engine is: &V2&&V3&&V4&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check the log files of the J2EE Engine for more information.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.