Web Reference: Apparentely you are using both System.Net.Http.Formatting and System.Web.Http as a reference. Do you need both of them references? Since it is a webapi project, maybe just System.Net.Http.Formatting would do it. You need to use a “extern alias” to manage two classes with the same namespace. Jul 18, 2025 · Two different assemblies referenced in your application contain the same namespace and type, which produces ambiguity. To resolve this error, use the extern alias feature with project reference aliases or do not reference one of your assemblies. To prevent runtime casting errors, the compiler stops and demands you fix the ambiguity. This is the most common cause. Your project might reference Library A (which uses Newtonsoft.Json v10) and Library B (which uses Newtonsoft.Json v13).
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