The example given in the Hello World Tutorial would not work on my system. I eventually traced the problem to the configuration of the mobilenet-ssd.blob file I was using. If I replaced the blob file taken for the ...depthai/resources/nn... path with the one included in the tutorial GIT ...depthai-tutorials-master/1-hello-world/mobilenet-ssd it worked.
Since I would prefer to used the blob files from depthai/resources/nn I investigated further and discovered I needed to modify the config to specify the number of shaves and cmx slices to match. ie those implied by the sh14cmx14NCE1 extension.

To use models from ...depthai/resources/nn... modify the tutorial code thus : -

# Create the pipeline using the 'previewout' stream, establishing the first connection to the device.
pipeline = device.create_pipeline(config={
    'streams': ['previewout', 'metaout'],
    'ai': {
        'blob_file': "/path/to/mobilenet-ssd.blob.sh14cmx14NCE1",
        'blob_file_config': "/path/to/mobilenet-ssd.json",
        'shaves': 14,
        'cmx_slices': 14,
        'NN_engines': 1
    }
})

if pipeline is None:
    raise RuntimeError('Pipeline creation failed!')

    Hi @julia76 ,

    Thanks for the fix/correction here! I have just asked Lukasz to update this following your feedback here.

    And sorry for not having made this clear to begin with.

    Thanks again,
    Brandon

    Hi julia76,

    I just updated the Hello World example documentation. Please let me know what you think and if there are any other improvements you can think of.

    The suffix required for the blob is certainly not intuitive and the errors may not be clear. I have that on my task list and will try my best to improve it!

    Best,
    Philip