MySQL - phpMyAdmin - Change a table column's data type

I am trying to alter a column’s data type but failed. I logged into cpanel then went to phpmyadmin then selected table named users, then selected structure then column name blood_group and clicked change button in the same row and got redirected to below url:

Some kind of error is occuring. Page is always loading, shows a message in developer mode ‘ERR_INCOMPLETE_CHUNKED_ENCODING’. Can not change the data type. What is the issue there?

I’d like to try this for myself. What column do you want to change to which data type?

Problem solved