Added Error Reporting

diff --git a/MagickWand/animate.c b/MagickWand/animate.c
index f67725f..4944979 100644
--- a/MagickWand/animate.c
+++ b/MagickWand/animate.c
@@ -574,7 +574,7 @@
             if (k != 0)
               clone_images=image_stack[k-1].image;
             if (clone_images == (Image *) NULL)
-              ThrowAnimateException(ImageError,"ImageSequenceRequired",option);
+              ThrowAnimateException(ImageError,"UnableToCloneImage",option);
             FireImageStack(MagickFalse,MagickTrue,MagickTrue);
             if (*option == '+')
               clone_images=CloneImages(clone_images,"-1",exception);