ORA-08341: On nCUBE, this command can only be executed from instance 1.
Cause: A command that can only be issued on instance 1 was issued elsewhere.
Action: Log on to instance 1 and repeat the command.
Official Explanation：
ORA-08341: On nCUBE, this command can only be executed from instance 1 is an Oracle Database error code which denotes that a user has attempted to execute an Oracle Server command from an nCUBE instance other than instance 1.
Common Case：
This error typically occurs when an nCUBE system is configured with multiple instances of Oracle Database, and a user attempts to execute a command from an instance other than the primary instance.
Normal Handling Steps：
To resolve this error, the user should log into the primary instance of Oracle Database (instance 1) and execute the command from there. Alternately, the user could manage the multiple instances by using the appropriate function in the Oracle Database administration interface.