Ok, there are some plugins that mess with the battle system.
Disable them all, and leave only the quest journal ON.
See if the battle will work.
If yes, then you have to turn it on one by one.
Turn on, test again.
Turn on another, and test again. Until the error appears, then you will know for sure what is the problem.
Also, Yanfly plugins have a specific order in the plugin manager. See if you have them in the proper order.