title: The name "DoublerConvert" does not exist in Namespace "clr-...."
body: <p>I realise that there are other questions with the same title, however I have tried all of those solutions to no avail. I am trying to use a converter that I have made. My other converter works fine, and this new one is a copy paste of the previous one, with the name changed, and the return value changed.</p>
  
  <p>XAML</p>
  
  <pre><code>xmlns:local="clr-namespace:ARC"
      &lt;local:DoublerConvert x:Key="DoubleConverter"/&gt; 'Doesn't work
      &lt;local:ValueConverter x:Key="NegativeConverter"/&gt; 'Works fine
  </code></pre>
  
  <p>CODE</p>
  
  <pre><code>Public Class ValueConverter
      Implements IValueConverter
  
      Public Function ProvideValue(serviceProvider As System.IServiceProvider) As Object
          Return Me
      End Function
  
      Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert
          Dim OldWidth As Integer = value
          OldWidth = -OldWidth
          Return OldWidth
      End Function
  
      Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
          Throw New NotImplementedException
      End Function
  End Class
  
  Public Class DoublerConvert
      Implements IValueConverter
  
      Public Function ProvideValue(serviceProvider As System.IServiceProvider) As Object
          Return Me
      End Function
  
      Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert
          Dim OldWidth As Integer = value
          Return 2 * OldWidth
      End Function
  
      Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
          Throw New NotImplementedException
      End Function
  End Class
  </code></pre>