下面这段程序出这种问题，谁能告诉我咋回事？ Exception in thread "main" java.lang.Error: Unresolved compilation problem:

public static void main(String args[]) throws IOException {
JpegImage frame = new JpegImage();
FileDialog f = new FileDialog(frame);
f.show();
File imageFile = new File(f.getDirectory()+ f.getFile());
// System.out.println(imageFile.getAbsolutePath());
image = ImageIO.read(imageFile);
System.out.println(image.getWidth() + ","+ image.getHeight());
// image = Toolkit.getDefaultToolkit().createImage(imageFile.getAbsolutePath());
JpegImage ji = new JpegImage(image);

for (int iChars = 0; iChars < 8; iChars++){
for(int j = 0; j < 8; j++){
System.out.print((char)(Y[iChars][j]));
}
}

for(int i = 0; i < BlockHeight[0]; i++){
for(int j = 0; j < BlockWidth[0]; j++){
YDCTBlock[i][j] = dct.forwardDCT((float[][])YBlock[i][j]);
}
}
YDCT = JpegInfo.unBlock(YDCTBlock);

for (int iChars = 0; iChars < 8; iChars++){
for(int j = 0; j < 8; j++){
System.out.print(YDCT[iChars][j]);
}
}
}