* @param  \WP_Term $category the category instance.
	 * @return string             A list of category parents.
	 */
	private function getCategoryParents( $category ) {
		if (
			$category->parent === $category->term_id ||
			absint( $category->parent ) < 1
		) {
			return '';
		}

		$parents = get_category_parents( $category->parent, false, '/', true );

		return is_wp_error( $parents ) ? '' : $parents;
	}

	/**
	 * Walks through category nicename and convert encoded parts
	 * into uppercase using $this->encode_to_upper().
	 *
	 * @since 4.2.0
	 *
	 * @param  string $nicename The encoded category string.
	 * @return string           The converted category string.
	 */
	private function convertEncodedToUppercase( $nicename ) {
		// Checks if name has any encoding in it.
		if ( false === strpos( $nicename, '%' ) ) {
			return $nicename;
		}

		$nicenames = explode( '/', $nicename );
		$nicenames = array_map( [ $this, 'convertToUppercase' ], $nicenames );

		return implode( '/', $nicenames );
	}

	/**
	 * Converts the encoded URI string to uppercase.
	 *
	 * @since 4.2.0
	 *
	 * @param  string $encoded The encoded category string.
	 * @return string          The converted category string.
	 */
	private function convertToUppercase( $encoded ) {
		if ( false === strpos( $encoded, '%' ) ) {
			return $encoded;
		}

		return strtoupper( $encoded );
	}

	/**
	 * Adds the required category rewrites rules.
	 *
	 * @since 4.2.0
	 *
	 * @param  array  $categoryRewrite  The current set of rules.
	 * @param  string $categoryNicename The category nicename.
	 * @param  string $blogPrefix       Multisite blog prefix.
	 * @param  string $paginationBase   WP_Query pagination base.
	 * @return array                    The added set of rules.
	 */
	private function addCategoryRewrites( $categoryRewrite, $categoryNicename, $blogPrefix, $paginationBase ) {
		$categoryRewrite[ $blogPrefix . '(' . $categoryNicename . ')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$' ]   = 'index.php?category_name=$matches[1]&feed=$matches[2]';
		$categoryRewrite[ $blogPrefix . '(' . $categoryNicename . ')/' . $paginationBase . '/?([0-9]{1,})/?$' ] = 'index.php?category_name=$matches[1]&paged=$matches[2]';
		$categoryRewrite[ $blogPrefix . '(' . $categoryNicename . ')/?$' ]                                      = 'index.php?category_name=$matches[1]';

		return $categoryRewrite;
	}

	/**
	 * Remove the category base from the category link.
	 *
	 * @since 4.2.0
	 *
	 * @param  string $link     Term link.
	 * @param  object $term     The current Term Object.
	 * @param  string $taxonomy The current Taxonomy.
	 * @return string           The modified term link.
	 */
	public function modifyTermLink( $link, $term = null, $taxonomy = '' ) {
		if ( 'category' !== $taxonomy ) {
			return $link;
		}

		$categoryBase = get_option( 'category_base' );
		if ( empty( $categoryBase ) ) {
			global $wp_rewrite; // phpcs:ignore Squiz.NamingConventions.ValidVariableName
			$categoryStructure = $wp_rewrite->get_category_permastruct(); // phpcs:ignore Squiz.NamingConventions.ValidVariableName
			$categoryBase      = trim( str_replace( '%category%', '', $categoryStructure ), '/' );
		}

		// Remove initial slash, if there is one (we remove the trailing slash in the regex replacement and don't want to end up short a slash).
		if ( '/' === substr( $categoryBase, 0, 1 ) ) {
			$categoryBase = substr( $categoryBase, 1 );
		}

		$categoryBase .= '/';

		return preg_replace( '`' . preg_quote( (string) $categoryBase, '`' ) . '`u', '', (string) $link, 1 );
	}

	/**
	 * Flush the rewrite rules.
	 *
	 * @since 4.2.0
	 *
	 * @return void
	 */
	public function scheduleFlushRewrite() {
		aioseo()->options->flushRewriteRules();
	}
}<br />
<b>Fatal error</b>:  Uncaught Error: Class 'AIOSEO\Plugin\Common\Main\CategoryBase' not found in /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/all-in-one-seo-pack/app/AIOSEO.php:323
Stack trace:
#0 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/all-in-one-seo-pack/app/AIOSEO.php(106): AIOSEO\Plugin\AIOSEO-&gt;load()
#1 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/all-in-one-seo-pack/app/AIOSEO.php(85): AIOSEO\Plugin\AIOSEO-&gt;init()
#2 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/all-in-one-seo-pack/app/AIOSEO.php(397): AIOSEO\Plugin\AIOSEO::instance()
#3 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/all-in-one-seo-pack/all_in_one_seo_pack.php(98): aioseo()
#4 /home/kordian1/domains/ostrabrama.pl/public_html/wp-settings.php(545): include_once('/home/kordian1/...')
#5 /home/kordian1/domains/ostrabrama.pl/public_html/wp-config.php(81): require_once('/home/kordian1/...')
#6 /home/kordian1/domains/ostrabrama.pl/public_html/wp-loa in <b>/home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/all-in-one-seo-pack/app/AIOSEO.php</b> on line <b>323</b><br />