SOLVED How to solve mb_http_input error? (Responsive Filemanager)

I am using responsive filemanager. It works on localhost but not on hosting. PHP version 8.1. Only this code gives an error: mb_http_input(‘UTF-8’);

mb_internal_encoding('UTF-8');
mb_http_output('UTF-8');
//mb_http_input('UTF-8');
mb_language('uni');
mb_regex_encoding('UTF-8');