Steps to reproduce:
Install a new instance of the suite
Put dev tools in place
Enable IN_DEV
Go to the Developer Center for 'System'
In Modules - Front, expand the 'Referral' row
Result is error below:
UnexpectedValueException: DirectoryIterator::__construct(C:\wamp64\www\dev\ips_47_dev_b/applications/core/modules/front/referral): The system cannot find the file specifi (code: 2) (0)
#0 C:\wamp64\www\dev\ips_47_dev_b\applications\core\modules\admin\applications\developer.php(290): DirectoryIterator->__construct('C:\\wamp64\\www\\d...')
#1 C:\wamp64\www\dev\ips_47_dev_b\system\Helpers\Tree\Tree.php(135): IPS\core\modules\admin\applications\_developer->IPS\core\modules\admin\applications\{closure}('referral')
#2 C:\wamp64\www\dev\ips_47_dev_b\system\Theme\Theme.php(4628) : eval()'d code(187): IPS\Helpers\Tree\_Tree->__toString()
#3 C:\wamp64\www\dev\ips_47_dev_b\system\Theme\Dev\Template.php(171): IPS\Theme\theme_core_admin_global_tabs(Array, 'modules-front', Object(IPS\Helpers\Tree\Tree), Object(IPS\Http\Url\Internal))
#4 C:\wamp64\www\dev\ips_47_dev_b\applications\core\modules\admin\applications\developer.php(150): IPS\Theme\Dev\_Template->__call('tabs', Array)
#5 C:\wamp64\www\dev\ips_47_dev_b\system\Dispatcher\Controller.php(118): IPS\core\modules\admin\applications\_developer->manage()
#6 C:\wamp64\www\dev\ips_47_dev_b\applications\core\modules\admin\applications\developer.php(69): IPS\Dispatcher\_Controller->execute('do')
#7 C:\wamp64\www\dev\ips_47_dev_b\system\Dispatcher\Dispatcher.php(153): IPS\core\modules\admin\applications\_developer->execute()
#8 C:\wamp64\www\dev\ips_47_dev_b\admin\index.php(13): IPS\_Dispatcher->run()
#9 {main}
Cause: there is no referral directory for that front module