code: def create_initial_tree(channel):
      
      # Create channel manager with channel data
      config.LOGGER.info("   Setting up initial channel structure... ")
      tree = ChannelManager(channel)
  
      # Make sure channel structure is valid
      config.LOGGER.info("   Validating channel structure...")
      channel.print_tree()
      tree.validate()
      config.LOGGER.info("   Tree is valid\n")
      return tree
docs: create_initial_tree: Create initial tree structure
          Args:
              channel (Channel): channel to construct
          Returns: tree manager to run rest of steps