Hi Shirly,
I'm Kevin from the Google Ads API team. I'll try my best to assist you.
It appears that the error you've encountered is related to this blog post. Based from the blog post, you will no longer be able to create or mutate Feed-based extensions in the AdWords API or the Google Ads API after the auto migration date. You can check this link for a sample on how to create an asset based extension instead.
Regards,
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