esi (7.x-3.0-alpha1) fails @ enable -> 'unrecoverable error'

drush pm-releases esi
	------- RELEASES FOR 'ESI' PROJECT -------
	 Release         Date         Status
	 7.x-3.0-alpha1  2012-Apr-05  Supported
	 7.x-3.x-dev     2012-Mar-22  Development


drush dl esi
	Project esi (7.x-3.0-alpha1) downloaded to                                                                [success]
	/www/test/sites/all/modules/contrib/esi.
	Project esi contains 4 modules: esi_panels, esi_context, esi_block, esi.

drush en esi
	The following extensions will be enabled: esi
	Do you really want to continue? (y/n): y
	WD php: PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'testdb.og' doesn't   [error]
	exist: SELECT base.gid AS gid, base.etid AS etid, base.entity_type AS entity_type, base.label AS label,
	base.state AS state, base.created AS created
	FROM
	{og} base
	WHERE  (base.gid IN  (:db_condition_placeholder_0)) ; Array
	(
	    [:db_condition_placeholder_0] => 0
	)
	 in EntityAPIController->query() (line 152 of
	/www/test/sites/all/modules/contrib/entity/includes/entity.controller.inc).
	Cannot modify header information - headers already sent by (output started at                             [warning]
	/data/webapps/drush-GIT/includes/output.inc:37) bootstrap.inc:1239
	PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'testdb.og' doesn't exist: SELECT base.gid AS gid, base.etid AS etid, base.entity_type AS entity_type, base.label AS label, base.state AS state, base.created AS created
	FROM
	{og} base
	WHERE  (base.gid IN  (:db_condition_placeholder_0)) ; Array
	(
	    [:db_condition_placeholder_0] => 0
	)
	 in EntityAPIController->query() (line 152 of /www/test/sites/all/modules/contrib/entity/includes/entity.controller.inc).
	Drush command terminated abnormally due to an unrecoverable error.                                        [error]