If you are getting that error you probably didn't compile the C library. You'll need to Android NDK for that.
You'll need to install that, create a makefile for that in the NDK install directory, and run make from there. I found the sample apps to be pretty helpful. Also, I just pushed up 0.19 code to github, which I had forgotten to do at 3AM when I pushed it out as an update. It contains SD card detection code which should have addressed your NPE problem.
BTW, I make no claims as to writing good code
has anyone ever tried rebuilding the app from the source code? can anyone give me hints or step-by-step explanation on how to create the makefile and NDK and stuff? i managed to export the source code/project into .apk, but when i tried it on emulator or actual device, it's always force closes right after saving recording, during the pitch correction progress
can anyone help? im developing on mac os x, pardon me for being a newbie at this stuff ^^
regards