Get instance of a class that inherits from abstract class and have specific value in a property

I'm working on a factory to create concrete instances based in two criteria:

1) The class must inherit from an specific abstract class

2) The class must have an specific value in an overridden property

My code looks like this:

public abstract class CommandBase
{
    public abstract string Prefix { get; }
}

public class PaintCommand : CommandBase
{
    public override string Prefix { get; } = "P";
}

public class WalkCommand : CommandBase
{
    public override string Prefix { get; } = "W";
}

class Program
{
    static void Main(string[] args)
    {
        var paintCommand = GetInstance("P");
        var walkCommand = GetInstance("W");  

        Console.ReadKey();
    }

    static CommandBase GetInstance(string prefix)
    {
        try
        {            
            var currentAssembly = Assembly.GetExecutingAssembly();
            var concreteType = currentAssembly.GetTypes().Where(t => t.IsSubclassOf(typeof(CommandBase)) &&
                                                                     !t.IsAbstract &&
                                                                     t.GetProperty("Prefix").GetValue(t).ToString() == prefix).SingleOrDefault();

            if (concreteType == null)
                throw new InvalidCastException($"No concrete type found for command: {prefix}");

            return (CommandBase)Activator.CreateInstance(concreteType);
        }
        catch (Exception ex)
        {            
            return default(CommandBase);
        }
    }
}

I'm getting the error:

{System.Reflection.TargetException: Object does not match target type. at System.Reflection.RuntimeMethodInfo.CheckConsistency(Object target) at System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)