Strange iOS error, this process hung in the debugger

Today I encountered this strange error:

Couldn't register applicationXXX with the bootstrap server. Error: unknown error code.
This generally means that another instance of this process was already running or is hung in the debugger.

It happend after I accidentally re-run the application while XCode was still building the code. Normally it doesn’t cause any trouble but for some reason it did. To solve this issue, I tried restarting XCode, iMac but the problem remains. until I see this article: that suggested to restart simulator. So, since I am using device directly, I restarted the device.

And it fixed the problem! haha very strange but interesting at the same time.

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