Because of an upgrade you probably have multiple versions of the same library in your userlib folder. Check for the OOXML library and remove the older versions (i usually rename them to .jar.excluded first in case I need them later on).
Clear deployment directory, sync project directory en deploy again.
If you are doubtful for jar file version you can manually try checking the jar file version added in your project for the Apache POI. See userlib folder of your project directory. If you see version is different, than download appropriate jar file from maven and add it.