ORA-00307

Error: ORA-00307: requested INSTANCE_NUMBER out of range, maximum is string

Causa: The initialization parameter INSTANCE_NUMBER specified a number that was out of range.

Acción: Change the value of INSTANCE_NUMBER to a valid range and restart the instance. The minimum value is 1 and the maximum value is the lower of the operating system-specific maximum or the value of the MAXINSTANCES option specified in the CREATE DATABASE statement. See also your operating system-specific Oracle documentation.