diff --git a/contrib/plugins/calendar/panels/calendar.html b/contrib/plugins/calendar/panels/calendar.html
index ebcb9fa..26d25bb 100644
--- a/contrib/plugins/calendar/panels/calendar.html
+++ b/contrib/plugins/calendar/panels/calendar.html
@@ -481,10 +481,11 @@ body {
       return;
     }
     try {
-      appEl.innerHTML = '<div class="test-msg">IT WORKS! events=' + (state.events ? state.events.length : 0) + ' cats=' + (state.categories ? state.categories.length : 0) + '<br>eventsType=' + typeof state.events + '<br>json=' + JSON.stringify(state.events).substring(0,100) + '</div>';
-      try { window.parent.go.main.App.WriteDebugLog('[iframe] innerHTML SET SUCCESSFULLY'); } catch(e) {}
+      appEl.innerHTML = renderHeader() + renderCategories() + renderView();
+      try { window.parent.go.main.App.WriteDebugLog('[iframe] render OK, view=' + state.view + ', events=' + state.events.length + ', cats=' + state.categories.length); } catch(e) {}
     } catch(e) {
-      try { window.parent.go.main.App.WriteDebugLog('[iframe] innerHTML error: ' + String(e)); } catch(e2) {}
+      appEl.innerHTML = '<div class="loading-screen">⚠ Ошибка: ' + escapeHtml(String(e)) + '</div>';
+      try { window.parent.go.main.App.WriteDebugLog('[iframe] render error: ' + String(e)); } catch(e2) {}
     }
   }