Explanation
Your change set was not shared. The change set might be empty, already shared, or already discarded.
User response
Refresh the browser page and try again. If the change set is empty, or is already shared, or discarded then you can not complete this action. Otherwise, ensure that you are the owner of this change set or have permission to modify other team members' change sets. Also, ensure that you have permission to write to the workspace you want to share into.