Diagnosis
The host system that you specified for the execution of your job is notdefined in the operation mode that is active when your job is started.You have either specified that your job is to be started when a specificoperation mode becomes active, or that it is to be started on a specificdate and at a specific time.
The job can only be executed, if the host is active as an unconfiguredinstance in the SAP system, if the background controller attempts tostart the job. An unconfigured instances must be started manually; it isnot started automatically as part of the operation mode.

Procedure
If possible, you should leave the host system field empty and save thejob again. The specification of a host system for the execution of a jobis only advisable if the job requires a resouce that is only availableon this host system. When you specify a host system, it also means thatthe automatic load balancing mechanism of the background controller hasno effect.
If you need to specify a host system, you should use theComputing Center Management Systems to determine whenthe host that you require is active in the SAP system.