UiAutomatorViewer 点了截图后总报 Error obtaining hierarchy

UiAutomatorViewer连上手机(adb devices已经识别出手机)点截图按钮后总报错Error obtaining hierarchy Reason:Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncException: Remote object doesn’t exist!
试过了好几个app,重启了UiAutomatorViewer和电脑后还是报这个错, 请老师帮忙看看,谢谢!

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