[Spacewalk-list] Problem subscribing client to a channel

[Alex]

so I've set up a new channel with label vmware-tools-i386-rhel6. however,
when trying to subscribe client to a channel, i'm getting
the following message:

# spacewalk-channel --add -c vmware-tools-i386-rhel6 --user username
--password password
Error communicating with server. The message was:

Error Message:
    Server already subscribed to 105
Error Class Code: 38
Error Class Info: The system is already subscribed to the specified channel.
Explanation:
     An error has occurred while processing your request. If this problem
     persists please enter a bug report at bugzilla.redhat.com.
     If you choose to submit the bug report, please be sure to include
     details of what you were trying to do when this error occurred and
     details on how to reproduce this problem.

even though in spacewalk GUI it shows that no clients are assigned to the
channel.

what could be a problem here?

Alex.
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