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Oracle/PLSQL: ORA-00107 Error

Error:

 ORA-00107: failed to connect to network listener process

Cause:

 The network listener process was not been successfully started.

Action:

 The options to resolve this Oracle error are:
  1. Make sure that the network configuration file is set up correctly.
  2. Make sure that the client-side address is set up correctly.
  3. Make sure that the listener initialization parameter file is set up correctly.