Chapter 8: excample-solution "ColorViewList" NullReferenceException

[repthor]

I can build "ColorViewList" for Android, iOS and UWP, but I allways get:

in line 25 of ColorView.xaml.cs.

(I hope, this link works and the screenshot appears. If not, I will explain.)

What can I do?

[repthor]

I built a try-catch arround the "bad" code-line:

It seems, as if
colorTypeConv.ConvertFrom(colorName);
can't convert anything...:

What is wrong with me and my Xamarin? Is it, because my choosen language is german? But, cannot be, since the system has no prob. with "Aqua"...

[repthor]

nope: