Zebra RFID API Mobile has stopped

I am developing an application in Android. I am trying to read some RFID tags but when I try to connect with the scanner reader, I've got this error : "Zebra RFID API Mobile has stopped". I am using the following devices: RFD2000 Scanner and TC20 PC. Usually, this application was working. I don't know if could be a problem about battery. Some help could be appreciated it. Thanks in advance.