I don't know what to say. Recently I've updated to my android-sdk, but not downloading the L version. On my pc now I have versions 8, 10, 14, 16, and 19. I suppose I have to change the path of android.jar basing on where I want my apps should be used.
By the way, the zipalign.exe was disappeared from my pc, but now that sorex gave me the file, I'm able again to compile my projects.