I've completed my investigation and have attached a demo app I build using your chart code after making corrections to the invalid XAML.
Find the demo attached, here is the result at run-time:
I recommend enabling the XAML Compilation (aka XamlC) feature
of Xamarin.Forms. You will experience build errors, instead of run-time errors, when there is invalid XAML.
If you have any further trouble, please open a support ticket here
and attach all the relevant code, or update my demo so that it replicates the issue. With this, we can investigate further.
Lance | Tech Support Engineer, Sr.
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