error 500 with captcha hikashop

-- Error-message(debug-mod must be tuned on) -- : when I install capta hikashop my website not is working more.

when I install capta hikashop my website not is working more.

Hi,

Could you look in your PHP error log for the error message you have when that 500 error happen ?
Also, which version of HikaShop are you using ? how did you configure your checkout ?
Do you have the error on every page of the website, even pages where there is no HikaShop ?