Failed to dump some hidden DEX

[Luluno01]

Greetings! I am trying to use DroidUnpack to unpack some applications (installed using the install_uninstall.sh script) packed by Baidu and Qihoo but with no luck. It could be some unexpected misconfiguration introduced by me but it unpacked the "Hello JNI" successfully. Then I dug into the source code and logs and found that the dex file extracted from captured argument of DoCall and Invoke was always system@[email protected] instead of the hidden dex file of interest, hence only the packer dex was dumped. Any ideas on why this is happening and what should I do to fix it? Am I doing something wrong that prevent DroidUnpack from working properly? Thanks!