function.php crash

I was addind code to my function.php to enable footer menu like this

register_nav_menus(
array(
‘main_nav’ => __( ‘Main navigation Menu’ ),
‘extra-menu’ => __( ‘Extra Menu’ )
)
);
}

but i got this error:

***************************************
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ‘)’ in /home/content/55/8319155/html/wp-content/themes/WK_theme/functions.php on line 44

********************************************************

I removed the code but the error is still. there. I check Line 44 and it was blank

Here is the file with error