Li Dazhuang

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乱码

![bug](https://user-images.githubusercontent.com/3030513/39344307-37ddaf70-4a14-11e8-8656-8390b4ee48d0.png) 同样乱码.

agents:add parameter validation when setting options

- Ensure that maxIterations is a positive integer. - Ensure that the errorHandler is not nil before assigning it.