File filter program that writes a log for one directory layer but no more, I have code for doing extra layers although cannot encorpate it

For this program I need to search multiple directory layers and then if the file is in a directory then the file name will have the directory name added to it. This is the code for the directory scanning so you can get an idea of what I mean:
[code]
public void processDirectory(String directoryName)
    {
        try
        {
            File dir = new File(directoryName);

            File[] files = dir.listFiles();

            for (int i = 0; i < files.length; i++)
            {
                if (files[i].isDirectory())
                {
                    processDirectory(directoryName + "/" + files[i].getName());
                }
                  }
        } catch (Exception e)
        {
            System.err.println("Problem with " + directoryName);
            System.exit(0);
        }
    }
[/code]

This is what I have managed to do so far, it includes comments. This is obviously not all of the code - I can post all of the code if you think it will help.

[code]
public void process(String[] argStrings, File files)
{
   
    //lots of code for validation of command line (the directory, copydate, fileextension1 and fileexttesnion 2 are entered on the command line)
   
    File folder = new File(name);
    processDirectory(folder); // This passes the folder (argstrings0 to the processdirectory method)

    MultiFilter multiFilter = new MultiFilter(fileExtensionOne);
      File[] htmlFiles = files.listFiles(multiFilter); //when this was folder.listFiles(multiFilter) it worked for one directory level

      multiFilter.setExtension(fileExtensionTwo);
    File[] phpFiles = files.listFiles(multiFilter);

    File[] filesToLog = mergeFiles(htmlFiles, phpFiles);
    log(filesToLog, archiveLimit, copyLimit);
  }

  public File processDirectory(File folder)
  {
    try
    {
      File[] files = folder.listFiles();

      for (int i = 0; i < files.length; i++)
      {
        if (files[i].isDirectory())
        { // once this method has found directories in the directories it recurses,
          processDirectory(directoryName + "\\" + files[i].getName()); // Add the directories to the filename so that they appear in the log

          return files[i];// here i am trying to get all the files in the directory (s) back to the method above so that they can be filtered
                          // i.e. either php or html as eneterd on the command line
        }
      }
    }
    catch (Exception e)
    {
      System.err.println("Problem with directory " + folder);
      System.exit(0);
    }
  }
 
  // Also I use this to run the application, this might be wrong also:
 
  import java.io.*;
 
  public class CrawlerApp
  {
    public static void main(String[] argStrings, File files)
    {
        Crawler crawler = new Crawler();
      crawler.process(argStrings, files);
    }
}
 
//At the moment my program does not compile and I get these errors:

//C:\Documents and Settings\User\Desktop\Crawler.java:209: processDirectory(java.io.File) in Crawler cannot be applied to (java.lang.String)
//processDirectory(folder + "\\" + files[i].getName());

[/code]
Thank you