运行rknnlite报错，求助

--> Load RKNN model
done
--> Init runtime environment
I NPUTransfer: Starting NPU Transfer Client, Transfer version 2.1.0 (b5861e7@2020-11-23T11:50:36)
E RKNNAPI: rknn_init,  recv(MsgLoadAck) fail, -9(ERROR_PIPE) != 368!
E Catch exception when init runtime!
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all device(s) with ntb mode:
TM018083200400309
*************************
E ['TM018083200400309']
E Traceback (most recent call last):
  File "/home/gary/py35/lib/python3.6/site-packages/rknnlite/api/rknn_lite.py", line 154, in init_runtime
    self.rknn_runtime.build_graph(self.rknn_data, self.load_model_in_npu)
  File "rknnlite/api/rknn_runtime.py", line 358, in rknnlite.api.rknn_runtime.RKNNRuntime.build_graph
Exception: RKNN init failed. error code: RKNN_ERR_DEVICE_UNAVAILABLE

发现把那个开关拨到usb模式就解决了...pcix1为啥不行呢??