Oracle : Ошибка ORA-12500

"TNS:listener failed to start a dedicated server process"
*Cause: The process of starting up a dedicated server process failed.
The executable could not be found or the environment may be set up
*Action: Turn on tracing at the ADMIN level and reexecute the operation.
Verify that the ORACLE Server executable is present and has execute
permissions enabled. Ensure that the ORACLE environment is specified
correctly in LISTENER.ORA. The Oracle Protocol Adapter that is being
called may not be installed on the local hard drive. Please check that
the correct Protocol Adapter are successfully linked.
If error persists, contact Oracle Customer Support.

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