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なんらかの理由で、メイン クラスが見つからない、またはロードできないというエラーが表示されます。だれか理由を教えてもらえますか?

package FindFile;

import java.io.File;

/**
 *
 * @author Kevin
 */
public class FindFile
{
    public void listFilesAndFolders(String directoryName)
    {
        File directory = new File(directoryName);       
        File[] fList = directory.listFiles();

        for (File file : fList)
        {
            System.out.println(file.getName());
        }
    }

    public void listFiles(String directoryName)
    {
        File directory = new File(directoryName);
        File[] fList = directory.listFiles();

        for (File file : fList)
        {
            if (file.isFile())
            {
                System.out.println(file.getName());
            }
        }
    }

    public void listFolders(String directoryName)
    {
        File directory = new File(directoryName);
        File[] fList = directory.listFiles();

        for(File file : fList)
        {
            if (file.isDirectory())
            {
                System.out.println(file.getName());
            }
        }
    }

    public void listFilesAndFilesSubDirectories(String directoryName)
    {
        File directory = new File(directoryName);
        File[] fList = directory.listFiles();

        for (File file : fList)
        {
            if (file.isFile())
            {
                System.out.println(file.getAbsolutePath());
            } else if (file.isDirectory())
            {
                listFilesAndFilesSubDirectories(file.getAbsolutePath());
            }
        }
    }

    public static void main(String[] args)
    {
        FindFile findFile = new FindFile();
        final String directoryWindows = "C:\\test";

        findFile.listFiles(directoryWindows);

    }
}
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