Hello, we’re sorry to hear that you’re facing issues while importing data from Yoast. This can sometimes happen due to various reasons, such as conflicts with other plugins or memory limitations.
Here are a few steps you can take to troubleshoot the issue:
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Check for Plugin Conflicts: Ensure that no other plugins are causing conflicts. You can do this by temporarily deactivating other plugins and trying the import again.
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Increase Memory Limit: If your site is running a large database, you might be hitting memory limits. Consider increasing the PHP memory limit in your hosting settings.
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Use Import & Export Feature: If the Setup Wizard is giving you trouble, you can manually import your Yoast settings using the Import & Export feature in Rank Math. Navigate to Rank Math SEO → Status & Tools → Import & Export and select the data you want to import from Yoast.

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Recalculate SEO Scores: After importing, you can recalculate SEO scores for posts set as N/A if needed.
If you’re still experiencing issues after trying these steps, please reply to this ticket with your site URL, and a human agent from our support team will assist you further.
Sources:
Migrating from Yoast SEO to Rank Math SEO » Rank Math
How to Setup Rank Math SEO Plugin Properly
still getting an error with tools when it tries to calculate seo scores
Hello,
You can continue the setup by skipping the importing process. After that, please try reimporting the data in WordPress Dashboard > Rank Math > Status & Tools > Import & Export > Other Plugins, then under the plugin column, uncheck the Calculate SEO Scores option below, and click the Import button.
Here’s a screenshot for your reference:

Please note that some options are only available in Advanced Mode. If you are not able to find the Import & Export, please try to switch to Advanced Mode: https://rankmath.com/kb/switch-from-easy-to-advanced-mode/
Once the import process is done, you can recalculate the scores by following the steps from this link: https://rankmath.com/kb/rank-math-status-and-tools/#recalculate-seo-score-for-posts
Let us know how it goes. Looking forward to helping you.
Thank you.
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.