Please go to Properties > Build, change the Platform target to one of them (either x86 or x64) depending on which architecture your running on and not "Any CPU" as shown in the picture attached. You need to choose a specific target because the DLL references are platform specific. When you debug/run the application now, you no longer will be seeing the warning.
This warning is common to both 1.2 and 1.3 DLLs if you don't specify the architecture.
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