SPUN ERROR

I did theme check and this is what I got:

WARNING: The flexible-width and fixed-width tags changed to fluid-layout and fixed-layout tags in WordPress 3.8. Additionally, the responsive-layout tag was added. Please change to using one of the new tags.
REQUIRED: Found a Customizer setting that did not have a sanitization callback function. Every call to the add_setting() method needs to have a sanitization callback function passed.
RECOMMENDED: could not find the file readme.txt in the theme. Please see Theme_Documentation for more information.
RECOMMENDED: Screenshot size should be 880×660, to account for HiDPI displays. Any 4:3 image size is acceptable, but 1200×900 is preferred.
RECOMMENDED: No reference to add_theme_support( “title-tag” ) was found in the theme. It is recommended that the theme implement this functionality for WordPress 4.1 and above.
INFO: Possible hard-coded links were found in the file footer.php.
Line 23: <?php printf( __( ‘Theme: %1$s by %2$s.’, ‘spun’ ), ‘spun’, ‘Caroline Moore‘ ); ?>
INFO: Only one text-domain is being used in this theme. Make sure it matches the theme’s slug correctly so that the theme will be compatible with www.ads-software.com language packs.
The domain found is spun