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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(140.8, 35%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMB%3C/text%3E%3C/svg%3E)
Hi, I have used Lottie animation in my uwp project, using Microsoft.Toolkit.Uwp.UI.Lottie NuGet package. When packaging, I get Failed message in WACK. Any help is greatly appreciated.
FAILED
General metadata correctness
Error Found: The general metadata correctness test detected the following errors:
Parameter value of method add_AnimatedVisualInvalidated of type Microsoft.Toolkit.Uwp.UI.Lottie.ILottieVisualSourceClass in file C:\Program Files\WindowsApps\24936DolphinTechnologies.WebDroid-ConvertWebsiteto_1.0.6.0_x64__b9gpbj0g87vwm\Microsoft.Toolkit.Uwp.UI.Lottie.winmd references the non-Windows Runtime type Microsoft.UI.Xaml.Controls.IDynamicAnimatedVisualSource. Windows Runtime types can reference only Windows Runtime types.
The type Microsoft.UI.Xaml.Controls.IAnimatedVisual referenced by type Microsoft.Toolkit.Uwp.UI.Lottie.ILottieVisualSourceClass in file C:\Program Files\WindowsApps\24936DolphinTechnologies.WebDroid-ConvertWebsiteto_1.0.6.0_x64__b9gpbj0g87vwm\Microsoft.Toolkit.Uwp.UI.Lottie.winmd was not found. All types referenced in metadata files must be discoverable.
Parameter value of method add_AnimatedVisualInvalidated of type Microsoft.Toolkit.Uwp.UI.Lottie.LottieVisualSource in file C:\Program Files\WindowsApps\24936DolphinTechnologies.WebDroid-ConvertWebsiteto_1.0.6.0_x64__b9gpbj0g87vwm\Microsoft.Toolkit.Uwp.UI.Lottie.winmd references the non-Windows Runtime type Microsoft.UI.Xaml.Controls.IDynamicAnimatedVisualSource. Windows Runtime types can reference only Windows Runtime types.
The type Microsoft.UI.Xaml.Controls.IAnimatedVisual referenced by type Microsoft.Toolkit.Uwp.UI.Lottie.LottieVisualSource in file C:\Program Files\WindowsApps\24936DolphinTechnologies.WebDroid-ConvertWebsiteto_1.0.6.0_x64__b9gpbj0g87vwm\Microsoft.Toolkit.Uwp.UI.Lottie.winmd was not found. All types referenced in metadata files must be discoverable.
Impact if not fixed: Microsoft store doesn't allow apps that don't pass Windows Runtime Metadata Validation.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 92%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERL%3C/text%3E%3C/svg%3E)
I have some questions here. What's the target version and min version of your app? I checked the Toolkit document of Lottie, it only supports build 17763 or higher. Does the min version meet this requirement? Another thing is that is this a local WACK test? If it is, you could upload your package to the partner center and there will be another online WACK test which will be more precise.
Yes, you are right. My project was 16299. That's is the problem. Thank you for your reply. I wish, Visual Studio could have notified me, when I used this namespace in my project.
Hi, If you post your reply as an answer, I accept it.
Thank you. I'll post an answer later.
Hello,
Welcome to Microsoft Q&A!
I checked the Toolkit document of Lottie, it only supports build 17763 or higher. Please make sure the target version and the min version of your project meet the version requirement.
Thank you.