Cannot run my App on a device disconnected from Xcode

With the last version of Xcode (12.0), I do not succeed to run my App on my device without usb cable.
When connected, the app is installed and works well, but when I remove the cable the App closes and I cannot reopen it...

I got an altert on Xcode saying "Lost connection to the debugger..."

For info: I am using Flutter sdk.
Please help..
Did you stop the app running via Xcode first, then try?


Cannot run my App on a device disconnected from Xcode
 
 
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