Change Theme dynamically

[ShehabFekry]

Bug explanation

I have a resource dictionary with this values assigned

<ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesign3.Defaults.xaml" /> <materialDesign:BundledTheme BaseTheme="Dark" PrimaryColor="LightBlue" SecondaryColor="LightBlue" /> </ResourceDictionary.MergedDictionaries>

I want to create a toggle button to change the value of the BaseTheme and primary and secondary colors using MVVM i binded the toggle to a method as shown below

               var pallete = new PaletteHelper();
               var theme = pallete.GetTheme();

when i try to get the theme i get this exception

System.InvalidOperationException: Could not locate required resource with key(s) 'MaterialDesign.Brush.Primary.Light

My project is a class library Revit plugin with some WPF views I don't have an App.xaml file

Version

5.1