multi language seo problem 404

i have setup seo successfully but when i choose Show language in the URL:

its return error 404

so i choose Use single URL for all languages:

but when you change the language for any item lets say

after change the language its give me this url

with error 404

so what's the wrong i did or what do i have to modify the .htaccess

the host is bluehost

any one can help me with this matter

thanks in advanced