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This error could appear due to issues with configuration of your listener, database or with extproc. First check that the permissions on extproc in your Oracle_home specified in your listener.ora file are valid:
Run the following ./extproc and it should display the banner.
If above is ok, then check for the domain name. One probable reason could be that if default_domain is set and that domain is not appended to the service name in tnsnames.ora, the connection fails.