Add debug info

src/library.liq

@@ -24,13 +24,13 @@
 #####################################
 
 def clear_items(ns) =
-    ret = server.execute("#{source.id(ns)}.primary_queue")
+    ret = server.execute("#{source.id(ns)}.queue")
     ret = list.hd(default="", ret)
     if ret == "" then
         log("Queue cleared.")
         (-1.)
     else
-        log("There are still items in the queue, trying skip ...")
+        log("There are still items in the queue '#{source.id(ns)}', skip RID #{ret} ...")
         source.skip(ns)
         (0.1)
     end