PHP Fatal error: Class name must be a valid object or a string

I don`t sure wether this error is an error for this module. I had posted this a few hour ago by the module field collection. This error appears with the field-collection-View:

I have a field-collecition-Field in a User-Profile2. After a User create an Item and click on the Save-Button the Server answer with a Fatal Error. In the error-Logfile i find this entry:

PHP Fatal error: Class name must be a valid object or a string in /var/www/mysite/includes/common.inc on line 7656, referer: http://mysite/user/687/edit/musiker

Here is the line 7656 in common.inc:

function entity_get_controller($entity_type) {
$controllers = &drupal_static(__FUNCTION__, array());
if (!isset($controllers[$entity_type])) {
$type_info = entity_get_info($entity_type);
$class = $type_info['controller class'];
7656-> $controllers[$entity_type] = new $class($entity_type);
}
return $controllers[$entity_type];
}

Who can help me!