If you are using the SiteGround hosting, please follow the steps below for the Xilifox Image Optimizer plugin to work properly.
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Step 1. #
Log in to your SiteGround dashboard and go to the “Websites” tab.
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Step 2. #
Find your website and click the “SITE TOOLS” button.
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Step 3. #
Go to the “Speed” tab and click on the “Caching” tab.
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Step 4. #
Disable the “NGINX DIRECT DELIVERY” option for your website.
Please wait a minute for the change to your website configuration to activate.
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Step 5. #
That’s all! The error on the plugin settings page should disappear.