added the error message change as mentioned in T1165

[dhirensr]

changed the error message as mentioned in https://github.com/tensorflow/tfjs/issues/1165 also tested in locally with yarn build, format, lint and test.

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This change is 

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[jayeshmann]

Is this PR complete yet?

[jenperson]

Thank you for your contribution! If you are still interested in adding this code, please sign the CLA.

[dhirensr]

@jenperson : the work is done and reviewed right. what's the blocker for merge?

[rthadur]

There is one more email which is used for commit , please sign the cla with that email as well

[dhirensr]

@rthadur : I don't have access to that email anymore. is there a way to remove that? would removing the commit and fixing on a new commit work?

[rthadur]

@dhirensr please resubmit the changes in a new PR if possible using one email which you signed CLA. Thank you

[rubiagatra]

I think this is issue solved @jenperson already fixed on @tensorflow/[email protected] https://github.com/tensorflow/tfjs/blob/tfjs-v4.10.0/tfjs-layers/src/engine/training.ts#L170

we can close this PR