Q:

blowfish.php error in x-cart 4 installation

I have to try to install x-cart on my localhost, into 2nd step it's giving an error some think like below screenshot 

is there any problem with PHP versions please suggest me 
Thanks 

A:

Do you use X-Cart 4.7.7 and PHP7.1?
You can ignore the deprecated warnings on installation or set display_errors = Off in your php.ini file
Here is a patch for the sitemap.php and something else 
bt_php7.1ver2_148169-4.7.7-notFA.diff

