HTMLDOC Problem:

Htmldoc produced no pdf-output.
Commandline:
typo3conf/ext/htmldoc_linux/bin/htmldoc --datadir typo3conf/ext/htmldoc_linux/share/htmldoc -t pdf13  --webpage -f /var/www/vhosts/strennberger.at/httpdocs/typo3temp/hd_i2X7CJ - 2>/var/www/vhosts/strennberger.at/httpdocs/typo3temp/se_kbuLLD

This is the stderr output of the htmldoc command without the htmldoc_append parameters:
If you see no errors here please check your htmldoc_append parameters too.
typo3conf/ext/htmldoc_linux/bin/htmldoc: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory

These are the first 80 chars of the output of the htmldoc command. Regularily this should begin with %PDF:

This is the html-data passed to htmldoc:
<!DOCTYPE html
	PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<!-- FOOTER RIGHT "$PAGE" -->
<!-- FOOTER CENTER "" -->
<!-- FOOTER LEFT "" -->
<!-- HEADER RIGHT "" -->
<!-- HEADER CENTER "$TITLE" -->
<!-- HEADER LEFT "" -->
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

<!-- 
	This website is brought to you by TYPO3 - get.content.right
	TYPO3 is a free open source Content Management Framework created by Kasper Skaarhoj and licensed under GNU/GPL.
	TYPO3 is copyright 1998-2005 of Kasper Skaarhoj. Extensions are copyright of their respective owners.
	Information and contribution at http://www.typo3.com
-->

	<style type="text/css">
		/*<![CDATA[*/
	<!--
	/* default styles for extension "tx_slideshow_pi1" */
		.tx-slideshow-pi1 {
			text-align: center;
		}
/* default styles for extension "tx_flvplayer_pi1" */
		.tx-flvplayer-pi1 {
			text-align: center;
		}
	-->
		/*]]>*/
	</style>
	<title>strennberger.at: Zertifikate</title>
	<meta name="generator" content="TYPO3 3.8 CMS" />
	<script type="text/javascript">
		/*<![CDATA[*/
	<!--
		browserName = navigator.appName;
		browserVer = parseInt(navigator.appVersion);
		var msie4 = (browserName == "Microsoft Internet Explorer" && browserVer >= 4);
		if ((browserName == "Netscape" && browserVer >= 3) || msie4 || browserName=="Konqueror" || browserName=="Opera") {version = "n3";} else {version = "n2";}
			// Blurring links:
		function blurLink(theObject)	{	//
			if (msie4)	{theObject.blur();}
		}
		
	// -->
		/*]]>*/
	</script>


</head>
<body bgcolor="#FFFFFF">

	<!--  CONTENT ELEMENT, uid:1190/image [begin] -->
		<a name="1190"></a>
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="600" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="600" height="1" alt="" /></td></tr><tr><td valign="top"><img src="typo3temp/pics/d3dff1a96a.jpg" width="600" height="75" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:1190/image [end] -->
		
	<!--  CONTENT ELEMENT, uid:1189/image [begin] -->
		<a name="1189"></a>
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="600" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="600" height="1" alt="" /></td></tr><tr><td valign="top"><img src="typo3temp/pics/cefcddc4c3.jpg" width="600" height="190" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:1189/image [end] -->
		
	<!--  CONTENT ELEMENT, uid:796/image [begin] -->
		<a name="796"></a>
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="470" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="5"><img src="clear.gif" width="470" height="1" alt="" /></td></tr><tr><td valign="top"><img src="uploads/pics/ce.gif" width="150" height="107" border="0" align="top" alt="" title="" /><br /></td><td><img src="clear.gif" width="10" height="1" border="0" alt="" title="" /></td><td valign="top"><img src="uploads/pics/Zertifikat_iso.png" width="150" height="150" border="0" align="top" alt="" title="" /><br /></td><td><img src="clear.gif" width="10" height="1" border="0" alt="" title="" /></td><td valign="top"><img src="uploads/pics/ce_01.gif" width="150" height="107" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:796/image [end] -->
		
	<!--  CONTENT ELEMENT, uid:797/image [begin] -->
		<a name="797"></a><img src="clear.gif" width="1" height="50" border="0" class="spacer-gif" alt="" title="" /><br />
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="600" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="600" height="1" alt="" /></td></tr><tr><td valign="top"><img src="typo3temp/pics/e5f2dd298b.png" width="600" height="849" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:797/image [end] -->
		
	<!--  CONTENT ELEMENT, uid:1193/image [begin] -->
		<a name="1193"></a><img src="clear.gif" width="1" height="50" border="0" class="spacer-gif" alt="" title="" /><br />
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="551" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="551" height="1" alt="" /></td></tr><tr><td valign="top"><img src="uploads/pics/zertifikat_pastus.jpg" width="551" height="785" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:1193/image [end] -->
		
	<!--  CONTENT ELEMENT, uid:798/textpic [begin] -->
		<a name="798"></a><img src="clear.gif" width="1" height="50" border="0" class="spacer-gif" alt="" title="" /><br />
		<!--  Image block: [begin] -->
			<table width="211" border="0" cellspacing="0" cellpadding="0" align="left" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="200" height="1" alt="" /></td><td rowspan="2" valign="top"><img src="clear.gif" width="10" height="1" alt="" title="" /></td></tr><tr><td valign="top"><img src="uploads/pics/kunde.gif" width="200" height="175" border="0" align="top" alt="" title="" /><br /></td></tr></table>
		<!--  Text: [begin] -->
			<p class="bodytext">&nbsp;</p>
<p class="bodytext">&nbsp;</p>
<p class="bodytext">&nbsp;</p>
<p class="bodytext">&nbsp;</p>
<p class="bodytext">&nbsp;</p>
<p class="font-16b-gray">Uns ist es wichtig, dass die Kunden zurückkommen und nicht die Produkte.</p>
<p class="bodytext">&nbsp;</p>
<p class="font-16b-gray">Deshalb steht der Kunde bei uns im Mittelpunkt.</p>
<p class="font-16b-gray">&nbsp;</p>
		<!--  Text: [end] -->
			
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:798/textpic [end] -->
		
</body>
</html>