c# - The type 'Microsoft.SqlServer.Dts.Runtime.Wrapper.ApplicationClass' has no constructors defined

I recently need to do an upgrade on my project from .net 3.5 to .net 4 and connect to the new SQL server 2008 R2. After I upgrade and compile, it throws these 2 errors: Interop type ... According MSDN: The Microsoft.SqlServer.Dts.Runtime.Wrapper namespace

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