Bug introduced in 11.0.0 and fixed via paclet update

The Wolfram Mathematica site provides this example.

I have copied and pasted into a notebook. The resource is reached and correctly sampled.

However, the following does not run.

convnet = 
 NetChain[{ConvolutionLayer[20, {5, 5}], ElementwiseLayer[Ramp], 
   PoolingLayer[{2, 2}, {2, 2}], ConvolutionLayer[50, {5, 5}], 
   ElementwiseLayer[Ramp], PoolingLayer[{2, 2}, {2, 2}], 
   FlattenLayer[], DotPlusLayer[500], ElementwiseLayer[Ramp]}, 
  "Input" -> NetEncoder[{"Image", {32, 32}}]]

The following error is produced:

enter image description here

Apologies for the size.

Have other users experience the same error?

(I am on Windows 10).

  • $\begingroup$ I have contacted Technical Support. Will update if and when a reply. $\endgroup$
    – ubpdqn
    Aug 19, 2016 at 0:36
  • $\begingroup$ I have the same error - Windows 7 $\endgroup$
    – andre314
    Aug 19, 2016 at 0:54
  • 1
    $\begingroup$ It runs fine - Mma 11.0.0 Win7 $\endgroup$ Aug 19, 2016 at 0:54
  • $\begingroup$ Same error. (Using version 11.0.0 under Win 10, too.) $\endgroup$
    – Karsten7
    Aug 19, 2016 at 0:59
  • $\begingroup$ Same problem with this example. I have not tried other ones. $\endgroup$
    – andre314
    Aug 19, 2016 at 1:01

1 Answer 1


This is actually a bug in a separate paclet that corrupts kernel state. It happens to show up here in neural networks. It has been fixed and a patch issued, your local install should acquire the update in time, but you should be able to force an update by running PacletUpdate["Streaming"].

In the meantime (or if that doesn't work for you), you can avoid this issue by running NetChain; on a fresh kernel (i.e. Quit) before running the example code.

  • $\begingroup$ thank you very much for answer. $\endgroup$
    – ubpdqn
    Aug 24, 2016 at 20:39
  • $\begingroup$ Did this issue first appear in 11.0.0? I wish to add an appropriate bugs header, per site convention. $\endgroup$
    – Mr.Wizard
    Aug 31, 2016 at 7:30

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