TNS-12558: TNS:protocol adapter not loaded
Cause: On some platforms (such as OS/2), protocol adapters are loaded at run time. If the shared library (or DLL) for the protocol adapter has not been loaded, then this error is returned.
Action: For further details, turn on tracing and re-execute the operation. The trace file will have the name of the shared library (or DLL) that has not been loaded.