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Common WordPress Errors « WordPress Codex

"If you are encountering a WordPress error message or white screen, don’t panic. Someone will have encountered the same message before and it can easily be solved.

This page lists the most common WordPress errors experienced by WordPress users, and provides a starting point for fixing them. You will also find links to more detailed pages on the WordPress Codex. If you can’t find your answers here, try the WordPress Support Forums where a volunteer will be there to help."