All Oracle Error CodesOracle DBA Forum

NNO-00050:

serious errors in configuration data, server cannot run
Cause: The server's configuration data has a problem of some sort which prevents the server from starting.
Action: Previous error messages in the log file will specify the exact problems leading to the shutdown. The problem most frequently occurs when the network is broken up into multiple administrative regions and the delegation points are incorrect. Read the Oracle Names documentation sections on region delegation and ensure that their directions are being followed correctly.