When I use the iOS simulator, I have no problem joining the process. But when I want to connect to the process on my iPhone, it does not work. When I enter the process name and click Attach, it takes some time before showing me the following error:

It seems that I am getting the same error for any process id, even if the process id does not exist:

I think this problem is related to my iPhone (5S iOS 8.3), because on another iPhone (5) I do not have this problem. Can someone please help me ...
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