XAML adding namespace for converters class

I'm getting "The name xxx does not exist in yyy" all the time. I don't understand why, i think i tried all possible combinations. All of my cs file, including main window are in "Web_Media_Seeker_WPF" namespace Converters.cs ``` using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Data; namespace Web_Media_Seeker_WPF.WPFConverters { public class BoolToValueConverter<T> : IValueConverter { public T FalseValue { get; set; } public T TrueValue { get; set; } public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null) return FalseValue; else return (bool)value ? TrueValue : FalseValue; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return value != null ? value.Equals(TrueValue) : false; } } public class BoolToObjectConverter : BoolToValueConverter<Object> { } public class BoolToStringConverter : BoolToValueConverter<String> { } public class BoolToBrushConverter : BoolToValueConverter<System.Windows.Media.Brush> { } public class BoolToVisibilityConverter : BoolToValueConverter<System.Windows.Visibility> { } public class BoolToColorConverter : BoolToValueConverter<System.Windows.Media.Color> { } public class BoolToImageSourceConverter : BoolToValueConverter<System.Windows.Media.ImageSource> { } public class BootToBoolConverter : BoolToValueConverter<bool> { } public class AddValueConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { object result = value; int Value; if (value != null && targetType == typeof(Int32) && int.TryParse((string)parameter, System.Globalization.NumberStyles.Integer, culture, out Value)) { result = (int)value + (int)Value; } return result; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } } ``` MainWindow.xaml ``` <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namesapce:Web_Media_Seeker_WPF.WPFConverters" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="Web_Media_Seeker_WPF.MainWindow" Title="Web Media Seeker" Height="563" Width="836"> <Window.Resources> <local:BoolToImageSourceConverter x:Key="BoolToWorkImageSource" TrueValue="Images/work.png" FalseValue="Images/idle.png" /> <local:BootToBoolConverter x:Key="InvertBool" TrueValue="False" FalseValue="True" /> <local:BoolToStringConverter x:Key="WorkTooltip" TrueValue="Working..." FalseValue="Idle" /> </Window.Resources> and stuff... ``` Errors i have: The name "BoolToImageSourceConverter" does not exist in the namespace "clr-namesapce:Web_Media_Seeker_WPF.WPFValuesConverters". The name "BoolToStringConverter" does not exist in the namespace "clr-namesapce:Web_Media_Seeker_WPF.WPFValuesConverters". The name "BootToBoolConverter" does not exist in the namespace "clr-namesapce:Web_Media_Seeker_WPF.WPFValuesConverters". The tag 'BoolToImageSourceConverter' does not exist in XML namespace 'clr-namesapce:Web_Media_Seeker_WPF.WPFValuesConverters'. The type 'local:BoolToImageSourceConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. The type 'local:BoolToStringConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. The type 'local:BootToBoolConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.