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XLink error on NCSDK 2.10

Hello All,

I had a problem due to upgraded ncsdk 2.10.
The code, shown as below, is able to run on ncsdk 2.08.
On the version of 2.10, it just run one step of loop which crash occurs at the next step.
When back to the version 2.08, the problem doesn't happend again.
How to resolve this problem in ncsdk 2.10 ?

Best Regards.
cheng

for root, dirs, files in os.walk(path_to_images):
    for file in files:
       image_filename=root+'/'+file
       img = cv2.imread(image_filename).astype(np.float32)
       graph.queue_inference_with_fifo_elem(fifoIn, fifoOut, img, 'user object')
       output, userobj = fifoOut.read_elem()

The error is given by:

Number of categories: 10
/usr/local/lib/python3.5/dist-packages/mvnc/mvncapi.py:416: DeprecationWarning: The binary mode of fromstring is deprecated, as it behaves surprisingly on unicode inputs. Use frombuffer instead
  tensor = numpy.fromstring(tensor.raw, dtype=numpy.float32)
E: [         0] dispatcherEventReceive:247  dispatcherEventReceive() Read failed -1

E: [         0] eventReader:268 Failed to receive event, the device may have reset

E: [         0] checkGraphMonitorResponse:922   XLink error
Traceback (most recent call last):
  File "run.py", line 83, in <module>
    graph.queue_inference_with_fifo_elem(fifoIn, fifoOut, img, 'user object')
  File "/usr/local/lib/python3.5/dist-packages/mvnc/mvncapi.py", line 767, in queue_inference_with_fifo_elem
    raise Exception(Status(status))
Exception: Status.ERROR

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