ResolvePackageNotFound

[wangbin1027]

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Context of the issue

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[the remaining entries are only necessary if you are reporting a bug]

Process to reproduce the issue

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1. User creates TPOT instance
2. User calls TPOT fit() function with training data
3. TPOT crashes with a KeyError after 5 generations

Expected result

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Current result

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Possible fix

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name of issue screenshot

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