BluetoothClient.AddressesAndNames" list cannot be displayed.

After the mobile phone program is designed and installed on the mobile phone, during the actual test, it is found that the "BluetoothClient.AddressesAndNames" list cannot be displayed. What are the possible reasons? I have already written an IF when BTLIST. If you want to choose, set the BTLIST. element to Bluetooth client Terminal. Address and name