System.BadImageFormatException: Reference assemblies should not be loaded for execution

I have added the reference file "System.Speech" from

"Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5.2\System.Speech.dll".

It is required for proper execution of my program.

Here is my program:

using System;
using System.Speech.Synthesis;

namespace ConditioningSchemas
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Initializing...");
            SpeechSynthesizer synth = new SpeechSynthesizer(); // Initialize a new instance of SpeechSynthesizer.
            synth.SetOutputToDefaultAudioDevice(); // Configure output to Default Device (soundcard)
            synth.Speak("Dominate");
            Console.WriteLine();
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }
    }
}

This is the error message that I've been receiving:

System.BadImageFormatException: 'Could not load file or assembly 'System.Speech, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Reference assemblies should not be loaded for execution. They can only be loaded in the Reflection-only loader context. (0x80131058)'

Inner Exception: BadImageFormatException: Cannot load a reference assembly for execution.

I saw in other posts that I can delete the "obj" and "bin" folders and then clean the solution and then the project should work. I also tried migrating the entire solution to a solution but the program will not execute properly.

Any solutions?