This is in fact not really Wikitude SDK related, but more an Eclipse issue. Could you please delete your "bin" folder, clean the project and re-build it?
Maybe im just to stupid because im a newbie when it comes to android development but everytime i try to install the simplearbrowser.apk(out of the turtorials) i get following error:
Installation failed due to invalid APK file!
Please check logcat output for more details. Can somebody help me cause i'm really frustrated right now :(
daniel