Syntax 501 error, How to upload without error to FTP Server

Hello,

I have a problem, its to do with improper syntax, am looking online everythere for a solution, maybe some knows what's wrong here. My server works and I can upload otherways to guest user.

Just in the app, it gives me a 501 syntax error. Here is the code, I know something isn't right, I think its to do with the file upload format or something, not sure. Please help?

   ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftp) );
                ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;
                ftpRequest.UsePassive = true;
                ftpRequest.UseBinary = true;
                ftpRequest.Credentials = new NetworkCredential("guest", "guest");
                 
 
 
                     FileInfo finfo = new FileInfo(filePath);
                     byte[] fileContents = new byte[finfo.Length];
 
 
                     using (FileStream fread = finfo.OpenRead())
                     {
                         fread.Read(fileContents, 0, Convert.ToInt32(finfo.Length));
                         fread.Close();
                     }
 
 
                     using (Stream writer = ftpRequest.GetRequestStream())
                     {
                     
                         writer.Write(fileContents, 0, fileContents.Length);
                         writer.Close();
                                         
                     }