WordPress 4.3 update showing error

After updating to the latest version of wordpress, I’m seeing this error at the top of every page:

“The called constructor method for WP_Widget is deprecated since version 4.3.0! Use
__construct()
instead. in /home/vascuv0/public_html/wp-includes/functions.php on line 3457″

Then, when I take a look at the file mentioned, this is what I find:

” if ( WP_DEBUG && apply_filters( ‘deprecated_constructor_trigger_error’, true ) ) {
if ( function_exists( ‘__’ ) ) {
trigger_error( sprintf( __( ‘The called constructor method for %1$s is deprecated since version %2$s! Use %3$s instead.’ ), $class, $version, ‘

__construct()

‘ ) );
} else {
trigger_error( sprintf( ‘The called constructor method for %1$s is deprecated since version %2$s! Use %3$s instead.’, $class, $version, ‘

__construct()

‘ ) );
}
}

}”

I don’t know what wordpress is trying to tell me. Any ideas?

Thanks!