diff --git a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsSyncConstants.java b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsSyncConstants.java
new file mode 100644
index 0000000..7028e77
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsSyncConstants.java
@@ -0,0 +1,62 @@
+package org.gcube.portlets.widgets.wsthreddssync.client;
+
+
+/**
+ * The Class WsThreddsSyncConstants.
+ *
+ * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
+ * 
+ * Mar 11, 2021
+ */
+public class WsThreddsSyncConstants {
+	
+	
+	/**
+	 * The Class RightsMissing.
+	 *
+	 * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
+	 * 
+	 * Mar 11, 2021
+	 */
+	public static class RightsMissing {
+		
+		/** The Constant REQUEST_IT_TO_THE_VRE_MANAGER_OR_THE_PORTAL_ADMINISTRATOR. */
+		public static final String REQUEST_IT_TO_THE_VRE_MANAGER_OR_THE_PORTAL_ADMINISTRATOR = "Request it to the VRE manager or the portal administrator.";
+
+		/**
+		 * No run sync rights.
+		 *
+		 * @param scope the scope
+		 * @return the string
+		 */
+		public static String noRunSyncRights(String scope) {
+			
+			StringBuilder builder = new StringBuilder("It seems you are not authorized to run a syncronization task towards THREDDS Catalogue");
+			
+			if(scope!=null)
+				builder.append(" in the scope \""+scope+"\"");
+			
+			builder.append(". ");
+			builder.append(REQUEST_IT_TO_THE_VRE_MANAGER_OR_THE_PORTAL_ADMINISTRATOR);
+			
+			
+			return builder.toString();
+		}
+		
+		/**
+		 * No create config rights.
+		 *
+		 * @return the string
+		 */
+		public static String noCreateConfigRights() {
+			
+			StringBuilder builder = new StringBuilder("It seems you are not authorized to create a configuration towards THREDDS Catalogue.");
+			builder.append(REQUEST_IT_TO_THE_VRE_MANAGER_OR_THE_PORTAL_ADMINISTRATOR);
+			
+			return builder.toString();
+		}
+
+		
+	}
+
+}
\ No newline at end of file