fm install issue

[gesys]

when i want to save fm configuration i'll get the error message

[Cryptography]
[ ERROR ] CAM-CRP-1193 An error occurred while attempting to contact the active Content Manager to update the local CA information. Check your configuration to ensure that the configured URIs are valid and that there are services running at those locations. Reason: org.dom4j.DocumentException: Error on line 1 of document  : The reference to entity "REALMOID" must end with the ';' delimiter. Nested exception: The reference to entity "REALMOID" must end with the ';' delimiter.

any ideas how to proceed?

i installed the fm on 4 different sites, but i'll always get the same error message!?

when i try to connect to the  gateway/dispatcher uri via browser there's no problem!

[gesys]

i did some further investigations, i also get this error in the existing 10.2.1 (productive) environment, when i simply want to save the fm config again