The classes "k-success" and "k-danger" do not seem to exist in the Kendo UI stylesheet.
If you are using a Sass-based theme I would suggest applying classes "k-state-success" and "k-state-error". More about the Sass themes you could find here: https://docs.telerik.com/kendo-ui/styles-and-layout/sass-themes
Or another option is to create your custom classes and coloring the cells with CSS.
I hope that would help.
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