:wrench: Explicit the type encountered when not Slide

godot/addons/slide_show/projector/show/Show.gd

@@ -99,8 +99,8 @@ func _enforce_parameters() -> void:
 
 func _enforce_children() -> void:
 	assert(!slides.is_empty(), "A slideshow must contain slides")
-	for slide in slides:
-		assert(slide is Slide, "A slideshow can only contain slides")
+	for object in slides:
+		assert(object is Slide, "A slideshow can only contain slides but encontered %s" % object)
 
 
 func _next_id() -> int: