关于zxing实现二维码抛异常的问题

[码无痕]

Map<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); 
	    //内容所使用编码 
hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
 BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);

hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 会抛异常




求大神解救！！！