2901075 - AS Java node terminates with exit code 2150 - USER_AUTH_FAILED: Logonid "guest" is not unique!

AS Java fails to start.

You can see in dev_serverX log file the following error:

F ********************************************************************************
F *** ERROR => Java node 'serverX' terminated with exit code 2150.
F ***
F *** Please see section 'Java program exit codes'
F *** in SAP Note 1316652 for additional information and trouble shooting advice.
F ********************************************************************************

and in std_serverX log file:

Service [com.sap.security.core.ume.service] start ================= ERROR =================
CSN Component [BC-JAS-SEC-UME], DC Name [sap.com/com.sap.security.core.ume.service]
com.sap.engine.frame.ServiceException: Start of UME service failed. Check help topic "Start of UME Service Failed". Technical
details: Cannot find first configured anonymous user: guest: USER_AUTH_FAILED: Logonid "guest" is not unique!
[...]
FATAL: Critical shutdown with exit code [2150] was requested due to [AS Java cannot be started; core service [com.sap.security.core.ume.service] failed to start]

SAP NetWeaver Application Server Java all versions

exit code 2150, UME, ABAP, Built-in users, Logonid,  is not unique, Guest, com.sap.security.core.ume.service, failed to start, Start of UME service failed , KBA , BC-JAS-SEC , Security, User Management , Problem