Error while installing.

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Fatal error: Call to a member function add() on a non-object in /home/www/antaeus.dk/concrete/concrete/models/collection.php on line 650

I can not re-create the error.

In the address bar it said:http://antaeus.dk/concrete/index.php/install/-/configure/...

phpinfo:http://antaeus.dk/phpinfo.php

Version nr.: 5.4.0.5