To fix a WooCommerce plugin error, first note the exact error message. Update WordPress, WooCommerce, and the plugin, then clear any cache. If the issue started after an update, roll back the plugin version. Disable all plugins except WooCommerce to check for conflicts, then re-enable one by one. Switch to a default theme (Storefront) to test theme conflicts. Check WooCommerce → Status → Logs and enable WordPress debug log to see the real cause. If needed, increase PHP memory and contact the plugin developer with the error log.
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