Help:Installation/Troubleshooting

The following messages or issues have been recorded (after an upgrade of an existing SMW installation).

Known issues

A specific message may depend on the available wiki configuration (in the "LocalSettings.php") or wiki setup.

• "Use of undefined constant SMW_NS_PROPERTY - assumed 'SMW_NS_PROPERTY' in ...LocalSettings.php"
• Could not find package x.x.x at any version for your minimum-stability (stable) ...
• Database error: A database query error has occurred.
• Error: your composer.lock file is not up to date.
• Fatal error: Call to undefined function enableSemantics()
• Fatal error: Cannot declare class SemanticMediaWiki
• LocalSettings.php should only contain one `smwgNamespaceIndex` definition and the declaration should happen before `enableSemantics`.
• LocalSettings.php should only contain one `wgLanguageCode` definition and the declaration should happen before `enableSemantics`.
• Notice: Use of undefined constant …
• Parse error: syntax error, unexpected '?' in ... xxx.php
• Semantic MediaWiki was installed and enabled but is missing an appropriate upgrade key.
• The "https://repo.packagist.org/packages.json" file could not be downloaded: allow_url_fopen must be enabled in php.ini
• UnexpectedValueException ... SemanticMediaWiki::initExtension is not callable
• Your requirements could not be resolved to an installable set of packages.

Others

• Property namespace disappears in MediaWiki 1.27.*1
• Property namespace appears to be broken2
• Special pages used by SMW have disappeared, no special pages on SMW, no “Special:SMWAdmin”, no “Special:Browse” , and properties don’t work "... actually it seems the ConfirmEdit extension is causing the ..."34

See also

• Help page on general issues you may encounter

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