I added additional $8 in calculate_total_shipping function for handling charges and I got warning.
So what I did basically I change code from $total = $this->calculate_base_shipping() to $total = $this->calculate_base_shipping() + 8.00.
I found the above solution in one of the forum but I got the warning below when I updated the file
call_user_func_array() expects parameter 1 to be a valid callback, function ‘dfcg_load_scripts_footer’ not found or invalid function name in /home2/waas7m0aald4/public_html/wp-includes/plugin.php on line 525
Please can someone give solution to this error as soon as possible. I would really appreciate it. Thanks in advance.