BUG 20635389
If Oracle Database 11g was installed and Oracle Database 12c was not installed on all cluster nodes, then any database operations attempted by Oracle Fail Safe would fail with the following error:
OCIEnvNlsCreate failed FS-10999: An internal programming error has occurred
The Oracle Fail Safe server did not initialize the runtime environment if Oracle Database 12c was not installed on the system.
This problem has been corrected. The Oracle Fail Safe server now initializes correctly, regardless of the Oracle database version installed on the cluster nodes.
The workaround is to install Oracle Database 12c on all cluster nodes or downgrade to Fail Safe release 4.1.0.