EntityStorageException: None of the routers in the chain matched this request

When I try to install a demo on simplytest.me, I get the error below:

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: https://d26i1.ply.st/core/install.php?profile=promokit&id=1&op=do_nojs&op=do
StatusText: OK
ResponseText: Drupal\Core\Entity\EntityStorageException: None of the routers in the chain matched this request
GET / HTTP/1.1
Accept:          text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Charset:  ISO-8859-1,utf-8;q=0.7,*;q=0.7
Accept-Language: en-us,en;q=0.5
Host:            localhost
User-Agent:      Symfony/2.X
in Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (line 913 of /home/d26i1/www/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php).

After the install, theme doesn't work except admin pages.