lucentx

You could do something like this inside the loop:

<?php
  $size = 'thumbnail'; //thumbnail, medium, large or full
  echo get_the_post_thumbnail(get_the_ID(), $size, '');
?>

Or if you want to create a custom size you can do something like this:

<?php
if ( function_exists( 'add_image_size' ) ) {
  add_image_size( 'homepage-thumb', 220, 130, true );
}
echo get_the_post_thumbnail(get_the_ID(), 'homepage-thumb', $attr);
?>

More info here

Add a css color property like here

For more info go to css color property

I was getting the same error.

if ( version_compare( $current_version, '1.2.3', '<' ) ) {
		$opt = get_option('wpseo');

		foreach ( $opt as $key => $val ) {
			if ( !in_array( $key, array('ignore_blog_public_warning', 'ignore_tour', 'ignore_page_comments', 'ignore_permalink', 'ms_defaults_set', 'version', 'disableadvanced_meta', 'googleverify', 'msverify', 'alexaverify') ) ) {
				unset( $opt[$key] );
			}
		}

		update_option('wpseo', $opt);
	}

It seems that the one that’s causing the error are the options. The $opt variable above is trowing a string when it’s supposed to be an array. The only fast way that I’ve seen is by updating the settings on the Yoast WordPress SEO dashboard.