Error when using the function gather with a trained classifier using tall arrays

Hello,

I have trained a linear classifier on a big data matrix using tall arrays, then i used the function 'gather' to calculate the accuracy but i get the following error:

Error using matlab.bigdata.internal.executor.BroadcastMap/get (line 40)

Internal problem while evaluating tall expression. The problem was:

The specified key is not present in this container.

matlab version is R2020b - trail use

how can i fix this problem.

thanks in advance

[Walter Roberson]

The specified key is not present in this container.

We do not see that message often. I suspect there are multiple causes of it. The ones that that have been solved, have been chased down to needing to install either the Global Optimization Toolbox, or the Optimization Toolbox. I do not expect those to be your problem... but maybe??

[Amelia]

Actually I don't install global optimization toolbox, I will install it and try again. Thanks