It sounds like something isn't quite right in your library folder. Go to your project folder → userlib and check if there are old versions of libraries that are no longer used. This error specifically seems to be related to the apache poi library.
I had a very similar issue on a recent project, as Eline suggests, try removing all of the poi files from the userlib folder, this seemed to work for me. After I removed the files, in studio pro > App I then cleaned the deployment directory, synchronised the app directory and deployed for eclipse. Hope this helps