[Problem fix] Cannot redeclare class...

Hello, everyone. I searched myself all over this forum and I couldn't found any solutions for this problem. But I wrote to yi12345 and he wrote me a solution :) So this message is for people, who are lazy to reach your goals, but there won't be anymore.

This is a solution for error: "Cannot redeclare class MySQLi_DB ..."

The solution: Simply just delete constant.php file in install/include/ and then go to installation and remember, when you are filling installation data, don't forget to leave MySQL option in SQL connection info box.

fix what?

This is a solution of a problem for people, while installing T4. I haven't found solution in this forum for myself, so I am writing for them here.

ok thanks