Hello,
We apologize for the issue you are facing with the Content AI Post Editor. The error message you are encountering could be due to a few reasons. Here are some steps you can take to resolve the issue:
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Refresh Content AI Credits: Sometimes, refreshing your Content AI credits can help. You can do this by going to your WordPress Dashboard → Rank Math → General Settings → Content AI and clicking on the refresh icon. Here’s a screenshot for reference:

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Check Subscription Status: Ensure that your Content AI subscription is active. If it’s not, you may see messages indicating that you need an active plan to use the feature.

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Wait and Retry: If you have sent too many requests in a short time, you might need to wait a minute or two before trying again.
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Check Connection: Make sure your website is properly connected to your Rank Math account. If not, you will need to connect it to access Content AI features.

If these steps do not resolve the issue, please reply to this ticket with your site URL, and a human agent from our support team will assist you further.
Thank you for raising this concern, and we hope this helps!
Sources:
Resolving Content AI Related Issues » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.