Gns3 2.1.21 Difference between Cisco ASA and ASAv features in Gns3

in my lab

Gns3 2.1.21, Cisco ASA 8.4(2), Asdm 642

I successfully installed Cisco ASA image but ASDM didn't importing via Tftp server getting error..

but previous Cisco ASAv 942 and Asdm 741 installed successfully..

now what i do can i continue ASA or ASAv..???

ASA 842 and ASDM 642 are compatible in Gns3 2.1.21..???