diff --git a/share/manifest b/share/manifest
index b1d3af7..6be8300 100644
--- a/share/manifest
+++ b/share/manifest
@@ -21,9 +21,13 @@
 <meta charset="utf-8">
 <meta name="generator" content="pdf2htmlEX"/>
 """
-
+# base CSS styles
 @base.css
+
+# PDF specific CSS styles
 $css
+
+# necessary Javascript codes
 @jquery.js
 @pdf2htmlEX.js
 
@@ -38,6 +42,7 @@ new pdf2htmlEX.Viewer('pdf-main');
 <div id="pdf-main">
 """
 
+# PDF pages
 $pages
 
 """
diff --git a/src/HTMLRenderer/general.cc b/src/HTMLRenderer/general.cc
index 1aa2d21..7d35f6c 100644
--- a/src/HTMLRenderer/general.cc
+++ b/src/HTMLRenderer/general.cc
@@ -13,6 +13,8 @@
 #include <algorithm>
 #include <vector>
 
+#include <GlobalParams.h>
+
 #include "HTMLRenderer.h"
 #include "TextLineBuffer.h"
 #include "pdf2htmlEX-config.h"
@@ -35,10 +37,6 @@ using std::abs;
 using std::cerr;
 using std::endl;
 
-static void dummy(void *, enum ErrorCategory, int pos, char *)
-{
-}
-
 HTMLRenderer::HTMLRenderer(const Param * param)
     :OutputDev()
     ,line_opened(false)
@@ -49,8 +47,8 @@ HTMLRenderer::HTMLRenderer(const Param * param)
 {
     if(!(param->debug))
     {
-        //disable error function of poppler
-        setErrorCallback(&dummy, nullptr);
+        //disable error messages of poppler
+        globalParams->setErrQuiet(gTrue);
     }
 
     ffw_init(param->debug);