Tools basically do their job, becoming a debugger for the application. Sometimes after using Xcode to debug applications, I find that I cannot use Tools until I reboot the device.
Unlike Xcode, tools can be confused between two applications with the same name, but with different package identifiers. (Or, possibly, the same name and similar package identifiers.) When I have several versions of an application on a device, I often have to remove unnecessary ones to make Tools connect to the correct application.
So, remove all duplicate applications and restart the device.
Walt sellers
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