Add error second sentence#49

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AlexWUrobot wants to merge 5 commits intopython:3.7from

AlexWUrobot:add-error

Commits on Oct 13, 2018

Add errors one sentence.
AlexWUrobot
committed

Commits on Oct 16, 2018

Commits on Oct 22, 2018

build at the same branch.
AlexWUrobot
committed