I am working on uploading a picture to a server. I am able to successfully upload an image using iOS but when i try on android I get the error code 3. Currently using phoneg
I've asked Telerik about this issue that I experience with AppBuilder. According to their response it might be a bug in Cordova (I'm using 3.2).
They recommend updating to the latest FileTransfer library (also update all the dependencies) and see if that solves your issue. I actually ran into another problem compiling the new libraries.
I recommend trying that and see if that works for you.