如果请求者已经存在，则该请求者已经具有一个特定的到某个实现的绑定，您必须更改该实现以指向中介模块的导出。

If the requester already exists, then it already has a specific binding to an implementation that you must change to point to the mediation module's export.

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在您可以编辑视图前，您必须将该视图绑定到一个控件。双击视图控件可以选择一个已经存在的视图或者创建一个新视图。

You must bind a view to this control before you can edit the view. Double-click the view control to select an existing view or create a new one.

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