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Your PHP Installation Appears to Be Missing the MySQL Extension: What It Means and How to Fix It (2026)
TL;DRThe missing the MySQL extension message means PHP cannot find the function mysqli_connect, so WordPress stopped before it touched your database. Check the PHP version and the extension list for the account, choose one MySQL driver set, and reload. Plugins, themes and wp-config.php are not the cause.
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The Active Theme Is Broken. Reverting to the Default Theme: What It Means (2026)
TL;DRThe active theme is broken means WordPress already switched your site to a default theme. Restore the missing folder or file first, then reactivate your theme.
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Request Header or Cookie Too Large: What the 400 Error Means (2026)
TL;DRRequest header or cookie too large means one header line, usually Cookie, passed the server limit of about 8 KB. Test in a private window, clear that site cookies, then raise the limit only if you run the server.
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The Package Could Not Be Installed: Find the Real Cause (2026)
TL;DRThe package could not be installed is only a headline. The line under it names the check that failed. In our WordPress 7.1.4 lab, a plugin zip installed only when its main file sat inside one folder and nothing else sat beside that folder. Open the zip, fix its top level, and upload again. A failed upload changes nothing on the live site.
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Plugin Could Not Be Activated Because It Triggered a Fatal Error: Find the Real Cause (2026)
TL;DRWhen a plugin could not be activated because it triggered a fatal error, WordPress 7.1.4 hides the real PHP message. Load the failed address with action=error_scrape to read it, then match the line to a cause.
