Problem: This error message appears because of the following two reasons.

• You have a rep node - You have removed the rep node from the hierarchy - Once removed you are trying to add this rep node to another hierarchy.
  You removed a rep node from the hierarchy and tried to add it to another parent node without refreshing the rep node.
• When you add a rep node, sometimes, there is a delay in displaying the success message. Before the success message appears, you try to add the same rep node again.

Solutions: Perform the following to avoid getting this error message.

• After the rep node is removed, you have to restore the rep node. After you restored, this rep node would be visible under a parent node. You have to then move that rep node to a different parent node.
• Wait for the success message to display before you perform any action.