J2ME中读取文件at com.sun.midp.io.j2me.file.Protocol.openInputStream(+39)

J2ME中读取文件时总是出现以下异常：
  java.io.IOException: 
at com.sun.midp.io.j2me.file.Protocol.openInputStream(+39)
at com.sun.midp.io.j2me.file.Protocol.openInputStream(+9)
at org.readBook.myBook$ValidateTehread.run(+17)
这是怎么一回事啊？下面是代码，点击“阅读”按钮后，另一个窗口readForm弹不出来，并且提示上面的异常，关键是本来还好好的，可以运行，突然就莫名其妙不知道怎么的就成这样了，真真是郁闷了。。。

public class myBook extends List implements CommandListener {
private Command read = new Command("阅读",Command.SCREEN,1);
private readMIDlet parent;

public myBook(readMIDlet parent) {
super("我的书架",List.IMPLICIT);
this.parent=parent;
this.addCommand(read);
this.setCommandListener(this);
}

public void commandAction(Command c, Displayable d) {
if(c==read){
ValidateTehread vt = new ValidateTehread();
vt.start();
}
}

class ValidateTehread extends Thread{
public void run(){
try{
String fileUrl = "file:///root1/跨过千年来爱你.txt";
FileConnection fcFile = (FileConnection)Connector.open(fileUrl);
InputStream is = fcFile.openInputStream();
byte[] buffer = new byte[300];
int n = is.read(buffer,0,buffer.length);
String s = new String(buffer,0,n);
parent.changeForm("readForm", s); //转换到阅读窗口
fcFile.close();
}catch(Exception ex){
ex.printStackTrace();}}

try {
FileConnection fc = (FileConnection) Connector.open("file://root1/jason.txt", Connector.READ_WRITE);
InputStream fis = fc.openInputStream();
byte[] b = "Hello World".getBytes();
OutputStream fos = fc.openOutputStream();

fos.write(b, 0, b.length);
} catch (IOException e) {

e.printStackTrace();
}
return toString();
}
可以试试删除Administrator目录下wtk文件中的in.use文件