Hi,
It looks like you put the class hikashopBridgePaginationHelper in your pagination.php file but you just have to put the function I listed and just that function (no class).
Please check the code you wrote and don't hesitate to read the link that Nicolas gave you, the second link provide you a sample of "pagination.php" file.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.