Arduino Due Debugging with ATMEL SAM_ICE

I have a fresh instillation of Atmel Studio 7.0 and a newly purchased SAM_ICE.

I have no problem in uploading ASF based code to DUE through SAM_ICE Jtag interfece, but cannot star debugging. Below is the error message:

Failed to launch program
Error: Failed to load ELF executable.

I remember I did it without any problem with Ateml Studio 6.0 and SAM-ICE before. Is it possible the new SAM_ICE is malfunctioning?

Please help!