ORA-28535: invalid Heterogeneous Services

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ORA-28535: invalid Heterogeneous Services context
Cause: A HeterogeneousServices agent's driver module called an HS service
routine with an invalid HS context value. This probably is a logic error in the
driver.
Action: Contact Oraclecustomer support or your agent vendor.
ORA-28536: error inprocessing Heterogeneous Services initialization parameters
Cause: An error described bya subsequent error message prevented successful
processing of Heterogeneous Services initialization parameters from the ORACLE
server data dictionary.
Action: Check server datadictionary views HS_CLASS_INIT, HS_INST_INIT, and
HS_ALL_INITS. Look for conditions which could produce the error identified in
the error message immediately following this one.
ORA