V2 Help With Copyright Footer Getting error using snip using supreme theme

Hello, I am using the snip plugin with no success. I am getting the following error on line 9

Don’t Panic
The code snippet you are trying to save produced a fatal error on line 9:

syntax error, unexpected ‘2018’ (T_LNUMBER), expecting ‘,’ or ‘;’
The previous version of the snippet is unchanged, and the rest of this site should be functioning normally as before.

Please use the back button in your browser to return to the previous page and try to fix the code error. If you prefer, you can close this page and discard the changes you just made. No changes will be made to this site.

I am using this snip code

add_action(‘after_setup_theme’, ‘_my_sd_footer_changes’,15);
function _my_sd_footer_changes(){
remove_action( ‘dt_footer_copyright’, ‘dt_footer_copyright_default’, 10 );
remove_action( ‘dt_footer_copyright’, ‘sd_footer_copyright_default’, 10 );
add_action( ‘dt_footer_copyright’, ‘custom_dt_footer_copyright_text’, 10 );
}

function custom_dt_footer_copyright_text(){
echo ‘© 2018 Supreme Theme LLC. All Rights Reserved.’;
}