BlueImp File Upload Widget for Yii2 error yii2

I am working with BlueImp File Upload Widget for Yii2 but i am getting SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data error . How can i solve this thanks.

Here is screenshort for that http://awesomescreenshot.com/0ab4tc1wd0

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