SyntaxBomb - Indie Coders

I am trying to modify an android AGK manifest
I am using apktool
This is the .apk generated by AGK, it works fine
This is an apk produced by unpacking and then packing the previous apk
To produce the above file i execute the following commands
apktool d phone.apk (Which unpacks in to a folder called phone)
cd phone
apktool b . (Which packes in into phone.apk and stores in in a foldet called dist from which i upload the file)The .apk generated by apktool produces the following error when i try install it on my android phone: "The package appears to be corrupt". I haven't changed anything in the .apk, just unpacked it and packed it

Can anyone tell me what i may be doing wrong here or recommend another apk tool

Thanks for any help