Build warning - mismatch between the processor architecture - rvt 2019 = 4.7?

[Anonymous]

warning MSB3270: There was a mismatch between the processor architecture of the project being built "MSIL" and the processor architecture of the reference "RevitAPI", "AMD64". This mismatch may cause runtime failures. Please consider changing the targeted processor architecture of your project through the Configuration Manager so as to align the processor architectures between your project and references, or take a dependency on references with a processor architecture that matches the targeted processor architecture of your project. (yes there is another error, but it is the same issue, ignore).

Below I have attached images of the settings. The RevitAPI.dll is pathed to the 2019 folder so it should be compatible. 

     

Any thoughts? What am I missing? Note I am new to C# and building plugins.

Thanks for the help!

[Anonymous · Accepted solution]

Found the solution.

Build > Configuration Manager > Active solution platform: change Any CPU to x64

note the waring said "AMD64", This was the issue...

[Sean_Page]

You can also set this more globally in the Build Tab of the Project Properties using the Platform Target drop down.

 

[jeremy_tammik]

You can also fix it globally by editing the Visual Studio CSPROJ and VBPROJ project files:

• Processor Architecture Mismatch Warning and Key Hook
• Recursively Disable Architecture Mismatch Warning
• Architecture Mismatch Warning Disabler Update

I used this to remove this warning message from the Revit SDK samples, encompassing hundreds of projects.