Collection runner - data files on body (json)

Iโ€™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? Iโ€™m just getting no tests in this request after running it.

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Try to make your request to โ€œtitleโ€:โ€œ{{title}}โ€

Looks of it, Value that you pass is string.

But in your current request it is not string.