Error Installation Wbb4

I got the following error during installation.

Fatal error: PHP notice in file C:\Program Files (x86)\Ampps\www\wbb4\wcf\lib\system\language\LanguageFactory.class.php (163): Undefined offset: 0
Information:
id: 45a0579c752a677ce83a6e285c0f47f022a39901
error message: PHP notice in file C:\Program Files (x86)\Ampps\www\wbb4\wcf\lib\system\language\LanguageFactory.class.php (163): Undefined offset: 0
error code: 0
file: C:\Program Files (x86)\Ampps\www\wbb4\wcf\lib\system\WCF.class.php (281)
php version: 5.3.21
wcf version: 2.0.0 Beta 1 (Maelstrom)
date: Fri, 31 May 2013 07:48:19 +0000
request: /wbb4/wcf/acp/index.php?&action=WCFSetup
referer: localhost/wbb4/install.php?step=installPackages

Stacktrace:

#0 C:\Program Files
(x86)\Ampps\www\wbb4\wcf\lib\system\language\LanguageFactory.class.php(163):wcf\system\WCF::handleError(8, 'Undefined offse...', 'C:\Program File...', 163, Array)
#1 C:\Program Files (x86)\Ampps\www\wbb4\wcf\lib\system\language\LanguageFactory.class.php(76):wcf\system\language\LanguageFactory->findPreferredLanguage()
#2 C:\Program Files (x86)\Ampps\www\wbb4\wcf\lib\system\WCF.class.php(336): wcf\system\language\LanguageFactory->getUserLanguage('1')
#3 C:\Program Files (x86)\Ampps\www\wbb4\wcf\lib\system\WCFACP.class.php(43): wcf\system\WCF->initLanguage()
#4 C:\Program Files (x86)\Ampps\www\wbb4\wcf\acp\global.php(19): wcf\system\WCFACP->__construct()
#5 C:\Program Files (x86)\Ampps\www\wbb4\wcf\acp\index.php(9): require_once('C:\Program File...')
#6 {main}