nocommerce 3.90 problem with google index

hi
i have redirection problem with my website which i did not designe it
i am working with google index around 1 and haf mount
now problem is redirection (301)
my website addres is :
http://www.mydomain.com/
and its redirecting to http://www.mydomain.com/en or /tr(turkish language)
well i tryed to turn off "SEO friendly URLs with multiple languages enabled"
but its just say page not found
and home page is not showing
and some time page complately not working with "ErrorPage.htm" incoming witch its not good for us
and when i active "SEO friendly URLs with multiple languages enabled" everything work find exept google index.

while this problem , google index wound see my sitemap also

is there anything i can do ?!

is there no one els ??

a

problem solved . i removed NOPCOMMERCE 3.90 and now i have PRESTASHOP. this one is better i guese because there are toomany people which they going to answer your question faster.

thank you for not respownd to my post