Error Backup configuration Oracle/Networker7.5

Hi everyone

I have a problem to create Client Backup Configuration using the NetWorker Module for Oracle 5.0. I give to the wizard, the information for the backup, database username, Net Service name, generate the rman script, and in the last screen when I have to click "Create" I receive the next screen with this error message:

Storing credentials to the lockbox:

     Operation Failed

     Unknown error encountered while creating lockbox

Undoing any previous Operations

     Rolling Back

     Successfully rolled back client "nameserver"

In /nsr/logs/daemon.raw I see this message:

nsr Error encountered while creating lockbox: The system hostname key is missing from the lockbox.

I don not see any register in the NMC --> "Configuration" --> Lockboxes --> (nothing)

Note: before this task was running correctly, but I have to reinstall the networker server and now I have this problem.

Thanks for your assistance.

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Angel