Unexplicable difference between Debug and release modes.

I use last version 6.0 of B4A.
My program connects external devices with Bluetooth, sends commands to them and receives answers from them. It also sends data over Internet. This program cannot be uploaded, mainly because it cannot be run by people not having same devices. It works fine in Debug mode, either connected with B4A-bridge or with a cable.
When run in Release mode (installed on the Tablet), it displays a message that gives no information. I attach the picture of the message.
There...

Unexplicable difference between Debug and release modes.

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