[UWP] Compile with "Compile with .NET Native tool chain" Failed : Internal compiler error: Specified cast is not valid

Dayanand PR 1

We developed UWP application and tried to upload it to Microsoft Store. During uploading process, we encountered "Supported API test" is failed in WACK (Windows Application Certification Kit) tool. So as per recommendation we have enabled the .Net native tool chain option in our project, but after enabling the source code it is not compiling and throwing below error.

C:\Users.nuget\packages\microsoft.net.native.compiler\2.2.8-rel-28605-00\tools\Microsoft.NetNative.targets(801,5): error : Internal compiler error: Specified cast is not valid.

It does not say where the error is.

can we use any settings to ignore the error? As the build works fine after disabling Compile with .Net Native tool chain option.

We need our application in Microsoft store and therefore we can't enable the .Net Native compiler option. Please help us overcome this problem.

Please find the attached file for Supported API Test errors detected in the WACK tool.

141992-supported-api-test-report-wack.txt

Thanks & Regards,
Dayanand PR

Roy Li - MSFT 31,766 Reputation points Microsoft Vendor

2021-10-20T07:40:56.087+00:00

Could you please tell me what's version of VS that you are using? And have you tried to build your app in other devices to see if you could do it successfully?
Dayanand PR 1 Reputation point

2021-10-20T08:39:53.567+00:00

Hi Roy Li, thanks for the reply. we are using Visual Studio 2019 v16.6.3, UWP Target v10.0.18362.0, UWP Minimum v10.0.17134.0, Xamarin Forms v4.8.0.1821.

And also tried by upgrading all the components to latest version but same result.

Yes tried on different devices, but no use.

Regards,
Dayanand PR
Roy Li - MSFT 31,766 Reputation points Microsoft Vendor

2021-10-21T06:14:33.187+00:00

Thanks for your information. Did you successfully build your app in release mode before? Or this is the first time that you are building your project in release mode? Do you have other devices which could package your app as well?
Dayanand PR 1 Reputation point

2021-10-21T07:05:05.577+00:00

Yes building first time with "Compile with .Net Native tool chain" option enabled in release mode. Previously we used to build with "Compile with .Net Native tool chain" option disabled.

Other devices means are you asking different Laptops or Desktops? If yes, then we have a different machines and facing the same issue.

We are following the below link to create the package.

packaging-uwp-apps

Regards,
Dayanand PR
Rob Caplan - MSFT 5,412 Reputation points Microsoft Employee

2021-10-21T21:47:38.317+00:00
Hi Dayananad,

It looks like you have two problems here that are likely unrelated:

The Supported API Test failure: from the log you uploaded, the application links to an MFC library. MFC is not supported in the UWP context, so you'll need to remove that library or reconfigure to call it in a desktop context.

.Net Native is required for UWP apps to publish in the store, so you'll need to find and fix the problem preventing that from building. You will want to use the latest version to pick up recent bug fixes, and if this problem still applies then we'll need to gather and examine some logs to find the specific problem you're working with.

Depending on the specifics of your app - especially if you have a strong dependency on the MFC component - you may need to rebuild it as a desktop app or desktop bridge app, and then package that for the store rather than building fully as a UWP app. This could bypass both UWP requirements.