PEAR causes Error

Hi, my PEAR causes the following error, by the time I browse my PEAR-Folder. Error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, [no address given] and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. -------------------------------------------------------------------------------- Apache/df-exts 1.1 Server at www.pear.domain.tld Port 80 That is the URL in Browsers Adress: http://www.pear.domain.tld/index.php?command=list-all&enableJS=1 But if I change it to this, I get the PEAR Search-Site... http://www.pear.domain.tld/index.php?command=search&enableJS=1 I even can take a look at PEARs Config-File... [url]http://www.pear.domain.tld/index.php?command=config-show&enableJS=1[/url] But all shown Hyperlinks [ list installed packages ] [ list not installed packages ] [ list avail. upgrades ] will cause the same error. Where is my mistake? V