How to handle System.Runtime.InteropServices.COMException (0x800706BA): The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

I am developing a Windows application where I manipulate Word Application. More specific, I am opening a Word Document but when I quit it and try to open another Word Document this Error comes out.

How to handle

System.Runtime.InteropServices.COMException (0x800706BA): The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) at Microsoft.Office,Word.ApplicationClass.set_Visible(Boolean Prop)**

If I don't quit the Word Application this error does not come out.

Below I show you the functions that I open and quit the Word Application.

    //function to open word Document located in a specific path
        public static void openWordDocument(string fileName)
        {
            try
            {
                wordApplication.Visible = true;
                string filePath = myPath + fileName;
                WordApi.Document docx = wordApplication.Documents.Open(filePath);
            }
            catch (Exception ex)
            {
                MyLogger.Error(ex.ToString());
            }
        }



//function to quit wordApplication 
  public static void CloseWordApp() {

            try {
                Object wordAppObject = Marshal.GetActiveObject("Word.Application");
                WordApi.Application wordApp = (WordApi.Application)wordAppObject;  //cast Object to its actual type
                wordApp.Quit();
            }
            catch (Exception ex) {
                 MyLogger.Error(ex.ToString());
            }

Most probably the exception is fired by the following line of code:

wordApplication.Visible = true;

You need to make sure the COM server is alive. Because after quitting the object becomes unavailable. I'd suggest setting such object references to null, so later we could check whether the application object is still alive. For example:

try
{
    if (wordApplication == null)
    {
        wordApplication = new Word.Application();
    }
    wordApplication.Visible = true;
    string filePath = myPath + fileName;
    WordApi.Document docx = wordApplication.Documents.Open(filePath);
}
catch (Exception ex)
{
    MyLogger.Error(ex.ToString());
}