I got a same problem
This behaviour were when Zebra RfidManager was not installed.
Download and Install it from RFD2000 support page and will run correct.
I have TC20 and RFD2000. I can't install rfid manager on TC20. I have an error message: "Package corrupt". Then i tried to install with adb on terminal but i couldn't install this way. But i saw error message detail as below
Package couldn't be installed in /data/app/com.zebra.rfid.rfidmanager-1 com.android.server.pm.PackageManagerException:
Only allow TC20 EDA with 8 POGO pins and for external RFID sled to install RFID manager APK
What could be the reason for not installing the application.