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单元 测试
I had this problem with an iPhone app, and fixed it using the following steps.
With your device connected, and Xcode open, select Window->Devices
In the left tab of the window that pops up, select your problem device
In the detail panel on the right, remove the offending app from the "Installed Apps" list.
After I did that, my app rebuilt and launched just fine. Since your app is a watchOS app, I'm not sure that you'll have the same result, but it's worth a try.