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. Property "Has description" (as page type) with input value "Explains various common problems when installing Semantic MediaWiki and how to fix them." contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process.

• "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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