Originally Posted by TheArtiszan
I am not sure if it needs to be signed or maybe there is a problem with the way the compile is working even though I am not getting any errors.
It's great that you want to learn how to invert or theme apps. But without meaning to discourage you, you need to do some reading. Quite a bit of reading by the sounds of it. There are a lot of threads on this subject, complete with tips, examples and introductory guides.
I can't shake the impression that you haven't read many threads about theming. And you seem to want the answer handed to you, rather than put a little work into learning this. You aren't asking a simple, straight forward question. You are asking for someone to teach you all of the ins and outs when you could easily find a tutorial yourself. Put a little initiative and work into this and then you will have something to be legitimately proud of when you finish inverting an app.
Unless you have an unusually easy app, you are probably missing multiple steps. You normally need multiple frameworks, emsure that your decompiler is up to date and yes there will be signing too. .9 pngs need special tools, you may need to edit dozens of image files and xml code too.
I'd encourage you to stick with it. But don't expect to succeed before you make an effort to read at least a handful of threads and guides and figure some of it out yourself.