DP0009: Why my morphing is not working (Mouth shape)? (Basic morphing)

Glossary
Color ID: Each color contains a unique ID number to distinguish the color even though they may use the same RGBA values. This prevents changing the color of one object while changing the other if they are painted with different color pot although they are in same RGB value.
Zone area: If the area is surrounded by the line, fully enclosed, it is considered as a zone for morphing
Brush lines: Brush lines are shapes that are formed by a contour which is a stroke that runs around the fill. They can be lines that result from vectorization, lines you draw with the Brush tool or shapes you fill with the paint tool.
Pencil lines: Pencil lines (AKA.Centerlines) are shapes that are formed by a stroke that runs down the center of the line and are of a single thickness. You can create centerline shapes with the Pencil, Ellipse, Rectangle, Line and Polyline tools.

Before proceeding further, please keep in mind the following morphing rules.

Morphing Rules:
-Color Art Mode and Line Art Mode layers are morphed separately. A shape in drawn in the Color Art Mode cannot be matched to a shape in the Line Art Mode, regardless of if the other matching conditions are met.
-Color ID: the color ID of shapes is compared to determine if they match. Only shapes that share the same color ID can be matched. If you want a zone to morph into another, you must paint both zones with the exact same color swatch. If you do not want zones with the same color to morph into each other, consider creating a new paint swatch with the same color values. Different color swatches with the same color values have different color IDs.
-Brush (contour) vs. Pencil line (centerline shapes): shapes drawn with the Brush tool are matched to other brush shapes. Centerline shapes can only be matched to other centerline shapes. You cannot morph a brush line into a centerline.
-Equal number of Zone will be morphed from one drawing to next one. If the second drawing contains more/less zone from the first one, one of the zone will be appeared/disappeared during morphing process 
-Proximity: if all the other conditions are met, then shapes are compared based on their proximity. The closer they are to each other in the source and destination drawing, the more likely they are to be matched.

Here are simple steps to help make morph much easier for mouth shapes, for example.

-Create two drawings of the mouth. Here is the example of the mouth chart.. Draw the open mouth (C) and wide open mouth (D) for example.
-Use the brush tool. Mixing Brush and pencil line will cause morphing to fail (see the morphing rule). You can use the all pencil lines, but for morphing the brush line is better since the pencil line does not close the area properly when two lines join (you can check this with contour tool by creating a circle with pencil line). This is because the line tips extend beyond the centerline itself.I only use the pencil line for morphing if I need to fake the area, for example closing the mouth (not completely) to open to compensate the zone rule.
-Using proper color ID, paint the line, tongue, and inner-mouth on both drawings. You can also paint it in the line art where you have drawn a line since with flatten, the painted area gets along with the line better during the morphing.
-Once all are done, use the contour hint (if you have used brush line) to help the morphing. Make sure you zoom in enough to see the point and the line better and move the contour hint point towards the line until it "sticks" to the line (as if magnetic). You are then assured that the hint is placed correctly.

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