Error after installation: Unsupported operand types in user.admin.inc

I had a problem with activation of the owa module on Drupal 7.41

After enabling the module, my site was dead (error 500).

Investigation revealed errors in PHP logs:
PHP Fatal error: Unsupported operand types in *mydrupalpath*\modules\user\user.admin.inc on line 712

This was caused by this statement in owa.module:
return array( 'administer open web analytics', 'opt-in or out of tracking in owa', 'use PHP for tracking visibility in owa');

I fixed it with this code:
return array(
'administer open web analytics' => array(
'title' => t('administer open web analytics'),
'description' => t('administer open web analytics'),
),

'opt-in or out of tracking in owa' => array(
'title' => t('opt-in or out of tracking in owa'),
'description' => t('opt-in or out of tracking in owa'),
),

'use PHP for tracking visibility in owa' => array(
'title' => t('use PHP for tracking visibility in owa'),
'description' => t('use PHP for tracking visibility in owa'),
),
);

This resolevd my issue. Hope this helps for others..