how to use droidunpacker?

[jerryhero]

when I load the plugin of "libunpacker.so". It prompt me loading successfully. but when I enter strings below. do_hookapitests com.android.providers.calendar It shows: teminate called after throwing an instance of 'std::invalid_argument' what():pparse error - unexpected end of input Aborted (core dumped)

could you tell me why it happened? Furthermore,Is there some document for me to use this droidunpacker plugin to unpack the apk?

[liowmark]

maybe you should check if "/home/developer/Droidscope/droidscope/DECAF_plugins/old_dex_extarctor/out/stats.json" is existed