我正在尝试使用Raspberry pi 2中的BLE创建GATT服务（内核版本：Linux raspberrypi 4.1.7-v7 +和Bluez版本：5.11 ）。我已将leoxsys BLE适配器连接到pi。我能够作为iBeacon做广告，并且在“Beacon Bits”iOS App中检测到广告信号。基于this tutorial我运行了命令sudo /usr/sbin/bluetoothd --plugin=time -n来启动示例GATT服务。它返回了以下内容：
bluetoothd[4818]: Bluetooth daemon 4.99
bluetoothd[4818]: Starting SDP server
bluetoothd[4818]: Ignoring (cli) pnat
bluetoothd[4818]: Ignoring (cli) audio
bluetoothd[4818]: Ignoring (cli) sap
bluetoothd[4818]: Ignoring (cli) input
bluetoothd[4818]: Ignoring (cli) serial
bluetoothd[4818]: Ignoring (cli) network
bluetoothd[4818]: Ignoring (cli) proximity
bluetoothd[4818]: Ignoring (cli) service
bluetoothd[4818]: Ignoring (cli) gatt_example
bluetoothd[4818]: Ignoring (cli) alert
bluetoothd[4818]: Ignoring (cli) health
bluetoothd[4818]: Ignoring (cli) thermometer
bluetoothd[4818]: Ignoring (cli) hciops
bluetoothd[4818]: Ignoring (cli) mgmtops
bluetoothd[4818]: Ignoring (cli) formfactor
bluetoothd[4818]: Ignoring (cli) storage
bluetoothd[4818]: Ignoring (cli) adaptername
bluetoothd[4818]: Ignoring (cli) wiimote
bluetoothd[4818]: Ignoring (cli) dbusoob
bluetoothd[4818]: Failed to init time plugin
bluetoothd[4818]: adapter_ops_setup failed
如何解决以下错误：
bluetoothd[4818]: Failed to init time plugin
bluetoothd[4818]: adapter_ops_setup failed