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Can you please let us know which version of Sitefinity are you using? This should not be a problem in the latest versions of Sitefinity (after Sitefinity 3.7 SP1). If they are regular .aspx pages in the root of your website you will have to create a directory for each of your languages and copy the pages for each language. For example for English you will have to create an en
folder in the root of your website and add the error pages there.
You can alternatively create your error pages in the CMS. For example create them in the root of the site map for each language version and then set them in the custom errors configuration section similarly to the markup bellow:
I have created a page called 404.aspx in the root of my CMS sitemap and set it to be non navigable.
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