How can i use multi language?

I got a update error my book as iTunes producer.

Maybe it should language problem, because i used 4 language( Eng, Cha, Jpn, Kor) together in one book

Because i hoped 4 countries people able read.

Is it possible? or not? Do I need to update separately for each language ?

If it's impossible, could you tell me another option?

I really want upload my book on iTunes

I look forward to you guys answer.

thank you.