Exception in thread "main" java.lang.Error: Unresolved compilation problem:?

at com.google.zxing.common.CharacterSetECI.getCharacterSetECIByName(CharacterSetECI.java:114)

at com.google.zxing.qrcode.encoder.Encoder.encode(Encoder.java:95)

at com.google.zxing.qrcode.QRCodeWriter.encode(QRCodeWriter.java:78)

at com.google.zxing.MultiFormatWriter.encode(MultiFormatWriter.java:102)

at com.zy.zxing.CreateQRCode.main(CreateQRCode.java:29)