Collection runner - data files on body (json)

I’m getting error when running through collection runner but when I manually send the post request with the data on it, it pass thru successfully. What is the problem with the setup below? I’m just getting no tests in this request after running it.

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Try to make your request to “title”:“{{title}}”

Looks of it, Value that you pass is string.

But in your current request it is not string.