Installation number -1 won't work

[MatzeKitt]

TimWolla said I have to post it...

Fatal error: Unsupported SQL statement 'ALTER TABLE wcf-1_acp_menu_item ADD FOREIGN KEY (packageID) REFERENCES wcf-1_package (packageID) ON DELETE CASCADE'

Information:

id: f972181f0a0c6d7af256a4a95ae673870543a6b6
error message: Unsupported SQL statement 'ALTER TABLE wcf-1_acp_menu_item ADD FOREIGN KEY (packageID) REFERENCES wcf-1_package (packageID) ON DELETE CASCADE'
error code: 0
file: E:\Webordner\tmp\6d0216f0\install\files\lib\system\database\util\SQLParser.class.php (167)
php version: 5.4.0
wcf version: 2.0.0 Alpha 1 (Maelstrom)
date: Tue, 31 Jul 2012 21:46:58 +0000
request: /wbb-installed/wcf2-test/install.php?step=createDB
referer: http://localhost/wbb-installed/wcf2-test/install.php
Stacktrace:

0 E:\Webordner\tmp\6d0216f0\install\files\lib\system\database\util\SQLParser.class.php(50): wcf\system\database \util\SQLParser->executeStatement('ALTER TABLE', 'ALTER TABLE wcf...')

1 E:\Webordner\tmp\6d0216f0\install\files\lib\system\WCFSetup.class.php(650): wcf\system\database\util\SQLParser->execute()

2 E:\Webordner\tmp\6d0216f0\install\files\lib\system\WCFSetup.class.php(259): wcf\system\WCFSetup->createDB()

3 E:\Webordner\tmp\6d0216f0\install\files\lib\system\WCFSetup.class.php(76): wcf\system\WCFSetup->setup()

4 E:\Webordner\wbb-installed\wcf2-test\install.php(796): wcf\system\WCFSetup->__construct()

5 {main}

[dtdesign]

Wait, why would you go full retard and use -1?

[MatzeKitt]

Don't ask me... TimWolla said that I should try it.