Broken WordPress

I have a blog on WP.

Today I wanted to add an entry and here's the error:

object from empty value in /var/www/asiaimport/data/www/vtrende.biz/wp-admin/ includes/post.php on line 627
Warning: number_format() expects parameter 1 to be double, string given in /var/www/asiaimport/data/www/vtrende.biz/wp-conten t/plugins/wordpress-seo/inc/class-wpseo-utils.php on line 608

And most importantly: not displayed full page for adding a new record (not field text).

Who will help solve the problem? The price issue?