response : {"err_msg":"server read sdk error, not ltv struct","err_no":-3001,"sn":"54e03d27-879d-48be-8652-23cd1afd96cb"}
12-30 18:08:04.158 V/ASREngine( 2280): ASRCallBack :8
12-30 18:08:04.158 E/ASREngine( 2280): EVoiceRecognitionClientWorkStatusError errorDomain : 33 errorCode : -3001 desc : Server parameters invalid. mLastRecognitionResult:
12-30 18:08:04.158 D/ASREngine( 2280): generateErrorResult errDomain = 33 errCode = -3001
12-30 18:08:04.161 D/itvapp.RecognitionManager( 2280): onEvent:{"sub_error":4001,"error":4,"origin_result":{"sub_error":4001,"error":4,"sn":"cuid=7D93527C2BEDA42D32BE7765A8840DF4|2511&sn=54e03d27-879d-48be-8652-23cd1afd96cb&nettype=1","desc":"Server param error"},"desc":"Server param error"}
12-30 18:08:04.161 V/ASREngine( 2280): ASRCallBack :18
12-30 18:08:04.161 D/itvapp.RecognitionManager( 2280): {"desc":"Server param error","error":4,"sub_error":4001,"origin_result":{"sn":"cuid=7D93527C2BEDA42D32BE7765A8840DF4|2511&sn=54e03d27-879d-48be-8652-23cd1afd96cb&nettype=1","desc":"Server param error","error":4,"sub_error":4001}}

语音识别返回-3001错误，是什么原因导致的？