Error 515 not connected to a Bluetooth device

I am creating an application to send messages via bluetooth, using 2 mobile devices, one containing the "client" application and the other, "server", everything works fine, but when I start both applications and activate bluetooth, the poster "error 515 appears not connected to a bluetooth device "on the whole screen even when they are already connected to each other, and I don't know why, it's also annoying

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server1 server2 client1 client2 the first 2 captures are from the server, the other 2 from the client