Thank you. I sent them a email.
I inactivated all plugins and then the backend started to work. When I activated Jetpack it stopped to work again. I deactivated all again and activated Jetpack first, it worked but hen I came to wpml and activated it I got this message:
Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to allocate 71 bytes) in /www/webvol16/ii/foz284oyofoyr2y/selinasevil.se/public_html/wp-content/plugins/sitepress-multilingual-cms/inc/taxonomy-term-translation/wpml-term-language-sychronization.class.php on line 167