Error message (Error 3300) with BLE

Hello, I'm trying to make an app that will read battery percentage and show it on phone.


image

its actually working and shows me the battery value every but when I initialize the app I getting a pop up error message:
" Error 3300: Error 9011 in extension BluetoothLE: Unknown Characteristic "
How its unknown char? everythings defines fine also checked on the Arduino code.
it disappears after number of seconds but why its even show it? its kind of annoying.

Thanks!

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