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PPFrame_DOM::expand: Invalid parameter type

Backtrace:

#0 /usr/local/apache/common-local/wmf-deployment/includes/parser/Parser.php(2733): PPFrame_DOM->expand(Object(PPNode_DOM), 0)
#1 /usr/local/apache/common-local/wmf-deployment/includes/parser/Parser.php(518): Parser->replaceVariables('{{PLURAL:1|Cate...')
#2 /usr/local/apache/common-local/wmf-deployment/includes/parser/Parser.php(4194): Parser->preprocess('{{PLURAL:1|Cate...', Object(Title), Object(ParserOptions))
#3 /usr/local/apache/common-local/wmf-deployment/includes/MessageCache.php(674): Parser->transformMsg('{{PLURAL:1|Cate...', Object(ParserOptions))
#4 /usr/local/apache/common-local/wmf-deployment/includes/GlobalFunctions.php(894): MessageCache->transform('{{PLURAL:1|Cate...', true, NULL)
#5 /usr/local/apache/common-local/wmf-deployment/includes/Skin.php(790): wfMsgExt('pagecategories', Array, 1)
#6 /usr/local/apache/common-local/wmf-deployment/includes/Skin.php(855): Skin->getCategoryLinks()
#7 /usr/local/apache/common-local/wmf-deployment/includes/SkinTemplate.php(257): Skin->getCategories()
#8 /usr/local/apache/common-local/wmf-deployment/includes/OutputPage.php(1559): SkinTemplate->outputPage(Object(OutputPage))
#9 /usr/local/apache/common-local/wmf-deployment/includes/Wiki.php(376): OutputPage->output()
#10 /usr/local/apache/common-local/wmf-deployment/index.php(118): MediaWiki->finalCleanup(Array, Object(OutputPage))
#11 /usr/local/apache/common-local/live-1.5/index.php(3): require('/usr/local/apac...')
#12 {main}