MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: DELETE /* MediaWikiBagOStuff::_doquery 127.0.0.1 */ FROM objectcache WHERE keyname='wikidb:messages:pt-br'
Function: doQuery
Error: HY000 out of memory
' in D:\sisuain\application\mediawiki\wiki\includes\db\Database.php:606
Stack trace:
#0 D:\sisuain\application\mediawiki\wiki\includes\db\DatabaseSqlite.php(77): Database->reportQueryError('out of memory', 'HY000', 'DELETE /* Media...', 'doQuery')
#1 D:\sisuain\application\mediawiki\wiki\includes\db\Database.php(540): DatabaseSqlite->doQuery('DELETE /* Media...')
#2 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(454): Database->query('DELETE FROM obj...', 'MediaWikiBagOSt...')
#3 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(324): MediaWikiBagOStuff->_doquery('DELETE FROM obj...')
#4 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(292): SqlBagOStuff->_query('DELETE FROM $0 ...', 'wikidb:messages...')
#5 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(251): SqlBagOStuff->delete('wikidb:messages...')
#6 D:\sisuain\application\mediawiki\wiki\includes\MessageCache.php(246): SqlBagOStuff->get('wikidb:messages...')
#7 D:\sisuain\application\mediawiki\wiki\includes\MessageCache.php(606): MessageCache->load('pt-br')
#8 D:\sisuain\application\mediawiki\wiki\includes\MessageCache.php(543): MessageCache->getMsgFromNamespace('Missing-article', 'pt-br')
#9 [internal function]: MessageCache->get('missing-article', true, false)
#10 D:\sisuain\application\mediawiki\wiki\includes\StubObject.php(58): call_user_func_array(Array, Array)
#11 D:\sisuain\application\mediawiki\wiki\includes\StubObject.php(76): StubObject->_call('get', Array)
#12 [internal function]: StubObject->__call('get', Array)
#13 D:\sisuain\application\mediawiki\wiki\includes\GlobalFunctions.php(467): StubObject->get('missing-article', true, false)
#14 D:\sisuain\application\mediawiki\wiki\includes\GlobalFunctions.php(432): wfMsgGetKey('missing-article', true, false, true)
#15 D:\sisuain\application\mediawiki\wiki\includes\GlobalFunctions.php(338): wfMsgReal('missing-article', Array, true)
#16 D:\sisuain\application\mediawiki\wiki\includes\Article.php(406): wfMsg('missing-article', 'Picking out Sys...', '')
#17 D:\sisuain\application\mediawiki\wiki\includes\Article.php(300): Article->fetchContent(0)
#18 D:\sisuain\application\mediawiki\wiki\includes\Article.php(218): Article->loadContent()
#19 D:\sisuain\application\mediawiki\wiki\includes\Article.php(803): Article->getContent()
#20 D:\sisuain\application\mediawiki\wiki\includes\Wiki.php(437): Article->view()
#21 D:\sisuain\application\mediawiki\wiki\includes\Wiki.php(59): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#22 D:\sisuain\application\mediawiki\wiki\index.php(93): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#23 {main}

Exception caught inside exception handler: exception 'PDOException' with message 'There is already an active transaction' in D:\sisuain\application\mediawiki\wiki\includes\db\DatabaseSqlite.php:267
Stack trace:
#0 D:\sisuain\application\mediawiki\wiki\includes\db\DatabaseSqlite.php(267): PDO->beginTransaction()
#1 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(448): DatabaseSqlite->begin()
#2 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(290): MediaWikiBagOStuff->_begin()
#3 D:\sisuain\application\mediawiki\wiki\includes\BagOStuff.php(251): SqlBagOStuff->delete('wikidb:messages...')
#4 D:\sisuain\application\mediawiki\wiki\includes\MessageCache.php(246): SqlBagOStuff->get('wikidb:messages...')
#5 D:\sisuain\application\mediawiki\wiki\includes\MessageCache.php(606): MessageCache->load('pt-br')
#6 D:\sisuain\application\mediawiki\wiki\includes\MessageCache.php(543): MessageCache->getMsgFromNamespace('Databaseerror', 'pt-br')
#7 D:\sisuain\application\mediawiki\wiki\includes\GlobalFunctions.php(467): MessageCache->get('databaseerror', true, false)
#8 D:\sisuain\application\mediawiki\wiki\includes\GlobalFunctions.php(432): wfMsgGetKey('databaseerror', true, false, true)
#9 D:\sisuain\application\mediawiki\wiki\includes\Exception.php(70): wfMsgReal('databaseerror', Array)
#10 D:\sisuain\application\mediawiki\wiki\includes\db\Database.php(2565): MWException->msg('databaseerror', 'Database error')
#11 D:\sisuain\application\mediawiki\wiki\includes\Exception.php(139): DBQueryError->getPageTitle()
#12 D:\sisuain\application\mediawiki\wiki\includes\Exception.php(174): MWException->reportHTML()
#13 D:\sisuain\application\mediawiki\wiki\includes\Exception.php(260): MWException->report()
#14 D:\sisuain\application\mediawiki\wiki\includes\Exception.php(294): wfReportException(Object(DBQueryError))
#15 [internal function]: wfExceptionHandler(Object(DBQueryError))
#16 {main}