The runtime throws an exception if a caller attempts to invoke an invalid operation.
如果调用者试图调用无效的操作，那么运行时将抛出异常。
For simplicity, we did not include error handling for cases such as an invalid operation called for the current state.
为了简单起见，我们并未包含处理对当前状态无效的操作调用等情况的错误处理。
An invalid operation was attempted on an active transport connection.
试图在活动传输连接上运行无效的操作。
Invalid operation for offline view.
对脱机视图的无效操作。
Invalid operation for offline view.
对脱机视图的无效操作。
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