Oracle Solution for Error ora-28506

ORA-28506: parse error in data dictionary translation for string stored in string

What triggered the Error:

reference to an ORACLE data dictionary table or view name on a heterogeneous database link to a non-Oracle system could not be translated. The ORACLE data dictionary tables shown with view HS_CLASS_DD contain invalid SQL for the data dictionary translation.

What should we do to fix it:

ntact customer support of the agent vendor.