"Use of undefined constant SMW_NS_PROPERTY - assumed 'SMW_NS_PROPERTY' in ...LocalSettings.php"

After installing and adding the following lines to the "LocalSettings.php" file

wfLoadExtension( 'SemanticMediaWiki' );
$smwgNamespacesWithSemanticLinks[SMW_NS_PROPERTY] = true;

the following message occurs:

"Use of undefined constant SMW_NS_PROPERTY - assumed 'SMW_NS_PROPERTY' in ...LocalSettings.php"

This error appears if your add extension loading instead of enabling semantics.1 To resolve this add the following to the LocalSettings.php file:

enableSemantics( 'example.org' );
$smwgNamespacesWithSemanticLinks[SMW_NS_PROPERTY] = true;