Closing open end of graphic for "FILL"

Likely your “frame” isn´t closed so yesterday I trace your image and gave it a go.
To check if your shapes are “pure” closed shapes read #5 of this post.

You just need to touch the shapes with the imageTrim Shapes tool to check for trouble points, when you touch the shape and all of it become a continuous red shape without points like in the above shape, it is pure close and ready for other operations.
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Pure closed shape.