fix the problem with multi language

I can't solve the multi language site. So, please fix me the problem .

Hi,
About your problem, we tried our best to fix. However, we see you install some of module about language that we don't know. Errors can arise from it.
I think you can delete all and rework. I'm sorry...
Thanks.

Hello,

i only install the modules after try our tutorial. However, i uninstall all modules and the error is the same. Please help with this problem or tell if this site can be a multi language site. If this information was in the description of product i never buy the product.

Hi,
I'm so sad because I can't fix your problem. I don't know why it not works.
Our demo site have multilanguage (French and English) , you can see it: demo.joomlaux.com/#capulus
Thanks.