Error while running powershell script from windows application

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C#

PowerShell

when first time i pressed the button i works fine if i again pressed the button it will raise the exception
Cannot invoke this function because the current host does not implement it.
if i deleted the folder which is created during script execution then again it works

ClasssLibrary1:Class
	Public string RunScript(string scriptText)
   {
      
       Runspace runspace = RunspaceFactory.CreateRunspace();
       runspace.Open();

       Pipeline pipeline = runspace.CreatePipeline();
       pipeline.Commands.AddScript(scriptText);

       pipeline.Commands.Add("Out-String");

       Collection<PSObject> results = pipeline.Invoke();

       runspace.Close();

       StringBuilder stringBuilder = new StringBuilder();
       foreach (PSObject obj in results)
       {
           stringBuilder.AppendLine(obj.ToString());
       }

       return stringBuilder.ToString();
   }
   
    public string LoadScript(string filename)
        {
            try
            {

                using (StreamReader sr = new StreamReader(filename))
                {

                    StringBuilder fileContents = new StringBuilder();

                    string curLine;

                    while ((curLine = sr.ReadLine()) != null)
                    {
                       
                        fileContents.Append(curLine + "\n");
                    }

                    return fileContents.ToString();
                }
            }
            catch (Exception e)
            {
               
                string errorText = "The file could not be read:";
                errorText += e.Message + "\n";
                return errorText;
            }

        }

Here is my script to:

rmdir D:\Logs

mkdir D:\Logs

Get-EventLog Application |Format-List | Out-File D:\Logs\app.txt
Get-EventLog System |Format-List | Out-File D:\Logs\app.txt

What I have tried:

I added all the dll files of powershell to my project also manually added refernce to it using this:<reference include="System.Management.Automation">