The app not worked, failed to scan...Please help me

[lomoao]

in the scanning page, SCAN and STOP flicker ceaselessly

the run log :::
....
D/BluetoothLeScanner: could not find callback wrapper
V/InputMethodManager: Reporting focus gain, without startInput
I/BluetoothAdapter: getBluetoothLeScanner
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: onScannerRegistered() - status=0 scannerId=10 mScannerId=0
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: could not find callback wrapper
V/InputMethodManager: Reporting focus gain, without startInput
I/BluetoothAdapter: getBluetoothLeScanner
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: onScannerRegistered() - status=0 scannerId=10 mScannerId=0
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: could not find callback wrapper
V/InputMethodManager: Reporting focus gain, without startInput
I/BluetoothAdapter: getBluetoothLeScanner
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: onScannerRegistered() - status=0 scannerId=10 mScannerId=0
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothAdapter: isLeEnabled(): ON
D/BluetoothLeScanner: could not find callback wrapper
V/InputMethodManager: Reporting focus gain, without startInput
......

[mvidaldp]

1. Which version of Android are you using?
2. Did you turn the Bluetooth and location on in your device?

[lomoao]

1. Android8.0.0
2. Yes, all turned on

[mvidaldp]

Do you own a Traumschreiber EEG device?