参照demo接入sdk之后，编译通过，真机调试时，语言识别报错：

[DEBUG][bds_EventManagerAsr.cpp:930]vr_handler work_status=8, encoded_err=2225219, err_desc=Server speech quality problem., need_finish=1, need_stop=0, need_loop=0

[DEBUG][bds_EventManagerAsr.cpp:931]vr_handler m_has_cancelled=0, m_need_cancelled_callback=0

[DEBUG][bds_StatisticsManager.cpp:83]request body: {"error_code":2225219,"voice_to_text_result":"","pid":15361,"cmd_type":0,"time":1513742217584751,"app_id":10555540,"cmd_id":0,"pkg":"com.hd.mobilecheck","type":"asr_normal","decoder":0}

请问这个错误代码是什么意思？或者说这个错误是如何引起的？