Invalid contract attribute for IMetadataExchange

Question

I have upgraded a WCF Service to .NET Framework 4.5. After doing so I noticed a blue squiggly line around the IMetaDataExchange in the host config file.

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Answer 1

If deleting the .SUO file doesn't work, check your references to ensure that you have the System.ServiceModel reference. That ended up being the issue that brought me here.