YAML for TYPO3

Hello,

i am testing the current if_yaml release 1.4.0 inside the typo3 introductionpackage 4.5.0 on a centOs 5.4 system (last stable php and mysql versions).

The problem is, I cannot use the download or update functions. For example if i click to download the pear package i am getting the error: Can not access source! If i am trying to download the if_additional files, i am getting a blank page (http 500). The same for downloading the if_ready2go files.

Firefox Live HTTP headers says:

http://<mydomain>/typo3conf/ext/package_manager/mod1/index.php

POST /typo3conf/ext/package_manager/mod1/index.php HTTP/1.1
Host: <mydomain>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729; .NET4.0E)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.6,de-de;q=0.5,de;q=0.4,en-us;q=0.3,en;q=0.1
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://<mydomain>/typo3conf/ext/package_manager/mod1/index.php
Cookie: be_typo_user=36478408e92bc88f889234aa3dc2bab1; tx_phpmyadmin=ufpohii051ssra98jd7tsh9gv7; typo3-login-cookiecheck=true; PHPSESSID=itsjcaif4d03i26glmi3jm0o25; fe_typo_user=ef70dcb5e23435f851d35136c12a07d6; Typo3InstallTool=b7f2fmpgqemlflm5cpbentiru3; admPanelPosX=; admPanelPosY=
Content-Type: application/x-www-form-urlencoded
Content-Length: 38
cmd=update&ek=if_yaml&package=yamlCore

HTTP/1.0 500 Internal Server Error
Date: Wed, 09 Feb 2011 10:07:14 GMT
Server: Apache
Expires: 0
Last-Modified: Wed, 09 Feb 2011 10:07:14 GMT
Cache-Control: no-cache, must-revalidate
Pragma: no-cache
Content-Length: 0
Connection: close
Content-Type: text/html;charset=utf-8
----------------------------------------------------------

Is this a known bug?

cheers
Guido