The stupid solution but which is always works is to replace that file with other. Find some small audio file, and rename it like that missed one and put it into /BravePrincessWhatever/Audio/SE/ folder. Hardest thing is that you have to find some online japanese virtual keyboard and reproduce that 4 hieroglyphs after "03" searching for them by how they looks, if you don't know languege. Also rename that file with same file extension as other files in /SE/ folder, ".mp3", ".ogg" or whatever format other files are. So result should look like "03????.mp3", or "03????.ogg", or "03????.wav". So in that case game will play that replaced file instead of original one and you will be able to continue your game, without having it closed because of error message.