Dear Aditya,
For the animation module, you need \startframe ... \stopframe. Mikael had changed it to \startframed ... \stopframed.
After changing \startframed to \startframe, it works well. I got the animated output.
I no longer use animation module, because the animations only work in acrobat, but in the past I had written a wrapper around the module to simplify metapost animations.
Yes, that is one bad thing.
https://adityam.github.io/context-blog/post/metapost-animation/
Thank you the info. Best regards, Dalyoung
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