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I have this dummy problem, can you help me with it? How to update the reference version. There is no such version in my lists of References.enter image description here

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  • is this from a Nuget?
    – Simon Price
    Commented Sep 20, 2017 at 14:05
  • Also, what version of .Net is your application running? as from the image I think this is a .Net 4.x.x. library youre trying to reference
    – Simon Price
    Commented Sep 20, 2017 at 14:06
  • Whether the System.Web.Http version 4.0.0.0 is referred in your project?
    – Venkat
    Commented Sep 20, 2017 at 14:12
  • See this : stackoverflow.com/questions/28604325/…
    – PaulF
    Commented Sep 20, 2017 at 14:12

1 Answer 1

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The optimum DLL requires the System.Web.Http version 4.0.0.0. But in your project you referred the higher version of System.Web.Http which is 5.2.3.0 . So confirm the same in your project and remove the higher version assembly version and attach the required version 4.0.0.0

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