diff --git a/src/main/java/org/gcube/datatransfer/resolver/geoportal/exporter/HTML_Page.java b/src/main/java/org/gcube/datatransfer/resolver/geoportal/exporter/HTML_Page.java
index bac2647..3d505e7 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/geoportal/exporter/HTML_Page.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/geoportal/exporter/HTML_Page.java
@@ -55,6 +55,7 @@ public class HTML_Page {
 				+ "          return response.json();\n"
 				+ "        } catch (error) {\n"
 				+ "          console.error(\"polling error: \" + error);\n"
+				+ "          showError(\"Error when exporting PDF :-(\");\n"
 				+ "        }\n"
 				+ "      }\n"
 				+ "      async function playPDFPoll() {\n"