After the upgrade of an existing SMW installation the following messages can occur which solely depend on the configuration of the "LocalSettings.php" file:
Error: your composer.lock file is not up to date.
- Error: your composer.lock file is not up to date. Run "composer update" to install newer dependencies1
- This is a conflict caused by MediaWiki due to how it is using "composer.json" file for its own purpose. It may occur when running MediaWiki's "update.php" maintenance script. Just add the
--skip-external-dependenciesflag to your command, e.g.:
php maintenance/update.php --skip-external-dependencies
Fatal error: Call to undefined function enableSemantics()
- Fatal error: Call to undefined function enableSemantics() in ... LocalSettings.php
- Something went wrong with the registration or installation, please re-read the instillation instructions. 2
- Fatal error: Call to undefined function enableSemantics()
- This kind of message appears if the Validator extension is still explicitly invoked. To resolve this the following line has to be removed:
- Fatal: Call to undefined function enableSemantics() …
- This kind of message appears for MW ≤ 1.21.x if the Extension Installer extension is included after the call to enableSemantics() (see above). Make sure that the call to include Extension Installer comes first.
Notice: Use of undefined constant …
- Notice: Use of undefined constant …
- This kind of message appears because SMW namespace constants (
SMW_NS_CONCEPT) are delayed due to the parameter
$smwgNamespaceIndexbeing a prerequisite and its initialization has to happen first it can be processed. To resolve this you have to addprior to any parameter (e.g. $wgContentNamespaces, $wgNamespacesToBeSearchedDefault and $wgNamespaceProtection) making reference to these namespace constants. In case you choose to manually set
enableSemantics( 'example.org' );
$smwgNamespaceIndexto something other than the default value of
102, you must do this above the enableSemantics() call.
Database error: A database query error has occurred.
After updating an existing SMW 1.9.0 installation the following messages may occur:
- Database error: A database query error has occurred. This may indicate a bug in the software.
- This error appears after an upgrade from SWM 1.9.0 to 1.9.1 when moving a page and if you have not updated the semantic store. To resolve this run the setup script from the base directory3 of your MediaWiki installation:
Property namespace disappears in MediaWiki 1.27*
- Property namespace disappears in MediaWiki 1.27*
- See 4
Property namespace broken
- Property namespace apparears to be broken
- See 5
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 ..."6, see also7
- Help page on general issues you may encounter
- Semantic MediaWiki: GitHub issue #2323
- Semantic MediaWiki: User mailing list thread "Problem upgrading MW - enableSemantics fatal error"
- This is the directory which contains the "LocalSettings.php" file.
- Semantic MediaWiki: GitHub issue #1424
- LinkedWiki: Phabricator issue #T160665
- Semantic MediaWiki: User mailing list thread "Installed SMW but no special pages"
- Semantic MediaWiki: GitHub issue #1406