C# : ASP.NET Web API - No 'MediaTypeFormatter' is available to read an object of type 'Int32'

C# : ASP.NET Web API - No 'MediaTypeFormatter' is available to read an object of type 'Int32'
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C# : ASP.NET Web API - No 'MediaTypeFormatter' is available to read an object of type 'Int32'
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Web 'MediaTypeFormatter' - to an 'Int32' : type C# available object is No API ASP.NET read of