Guid and NativeGuid throws a COMException

I'm trying to create new OU in the root of Active Directory, but it constantly throws an exception.Could there be because I'm tot an admin?

Link to screenshot: https://drive.google.com/file/d/1ERLT64PIWrCoECzq0GGTdwMR1mQqln9w/view?usp=sharing

`
public void CreateGroup()
        {   
            DirectoryEntry dir = new DirectoryEntry("LDAP://ENCOTEC");
            DirectorySearcher search = new DirectorySearcher(dir);
            search.Filter = "(OU=IT System)";
            SearchResult it = search.FindOne();
            if (it == null)
            {
                DirectoryEntry newEntry = dir.Children.Add("OU=IT System", "organizationalUnit");
                dir.CommitChanges();
            }
`