I can't set a custom error page

After I opened Cloudflare Pro and set up a custom error page, I received the following error: API Request Failed: PUT /api/v4/zones/custom_pages/500_errors (500), I use Github Pages and Cloudflare Pages to host this custom error page, but still report the error in dashboard, I set other pages when everything is fine, but now I can not set custom 500 error page, how should I solve it?

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