When you get -9 error that probably means the converted android app cannot run in the android player, perhaps not compatible due to the native codes inside. Some apps will have that error like Twicca so you cannot use them.
Not sure about -4 error though.
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I used to have -4 errors on certain android apps (really small apps, just a few MBs). I removed some files on my PlayBook so that the free space was more than 1.5GB, and then the errors were gone.
freeing up more memory (at least 2GB) can avoid the -4 code
however, the -9 i still don't get, but Jiatern is probably right... i get that when trying to sideload Naver's Line... which i really wish it can work on playbook someday
thanks guys!!