When I try to enter o modify this project Annali d'Italia, on which I worked from 2011, this message appears:
Quoted TextErrore interno [a20b8030] 2015-12-29 08:23:39: Errore irreversibile di tipo "MWException"
Thank you
LAGRANDE
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I can do a simple test edit, so it is not editing itself. Can you please describe the edit that you are looking to undertake.
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reedy@fluorine:/a/mw-log$ zgrep a20b8030 archive/exception.log-20151229.gz -A 30
2015-12-29 08:23:39 mw1067 itwikisource exception ERROR: [a20b8030] /wiki/Pagina:Annali_d%27Italia,_Vol._1.djvu/260 MWException from line 175 of /srv/mediawiki/php-1.27.0-wmf.9/extensions/Math/MathRestbaseInterface.php: Math extension can not find Restbase URL. Please specify $wgMathFullRestbaseURL. {"exception_id":"a20b8030"}
[Exception MWException] (/srv/mediawiki/php-1.27.0-wmf.9/extensions/Math/MathRestbaseInterface.php:175) Math extension can not find Restbase URL. Please specify $wgMathFullRestbaseURL.
#0 /srv/mediawiki/php-1.27.0-wmf.9/extensions/Math/MathRestbaseInterface.php(251): MathRestbaseInterface->getUrl(string, boolean)
#1 /srv/mediawiki/php-1.27.0-wmf.9/extensions/Math/MathMathML.php(102): MathRestbaseInterface->getFullSvgUrl()
#2 /srv/mediawiki/php-1.27.0-wmf.9/extensions/Math/Math.hooks.php(204): MathMathML->render()
#3 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(4249): MathHooks::mathTagHook(string, array, Parser)
#4 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/CoreParserFunctions.php(1046): Parser->extensionSubstitution(array, PPTemplateFrame_Hash)
#5 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(3804): CoreParserFunctions::tagObj(Parser, PPTemplateFrame_Hash, array)
#6 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(3538): Parser->callParserFunction(PPTemplateFrame_Hash, string, array)
#7 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Preprocessor_Hash.php(1061): Parser->braceSubstitution(array, PPTemplateFrame_Hash)
#8 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(3680): PPFrame_Hash->expand(PPNode_Hash_Tree)
#9 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Preprocessor_Hash.php(1061): Parser->braceSubstitution(array, PPTemplateFrame_Hash)
#10 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(3680): PPFrame_Hash->expand(PPNode_Hash_Tree)
#11 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Preprocessor_Hash.php(1061): Parser->braceSubstitution(array, PPFrame_Hash)
#12 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(3353): PPFrame_Hash->expand(PPNode_Hash_Tree, integer)
#13 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(1244): Parser->replaceVariables(string)
#14 /srv/mediawiki/php-1.27.0-wmf.9/includes/parser/Parser.php(441): Parser->internalParse(string)
#15 /srv/mediawiki/php-1.27.0-wmf.9/includes/content/WikitextContent.php(331): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#16 /srv/mediawiki/php-1.27.0-wmf.9/includes/content/AbstractContent.php(497): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#17 /srv/mediawiki/php-1.27.0-wmf.9/extensions/ProofreadPage/includes/page/PageContent.php(232): AbstractContent->getParserOutput(Title, integer, ParserOptions, boolean)
#18 /srv/mediawiki/php-1.27.0-wmf.9/includes/poolcounter/PoolWorkArticleView.php(140): ProofreadPage\Page\PageContent->getParserOutput(Title, integer, ParserOptions)
#19 /srv/mediawiki/php-1.27.0-wmf.9/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#20 /srv/mediawiki/php-1.27.0-wmf.9/includes/page/Article.php(676): PoolCounterWork->execute()
#21 /srv/mediawiki/php-1.27.0-wmf.9/extensions/ProofreadPage/includes/page/PageViewAction.php(42): Article->view()
#22 /srv/mediawiki/php-1.27.0-wmf.9/includes/MediaWiki.php(489): ProofreadPage\Page\PageViewAction->show()
#23 /srv/mediawiki/php-1.27.0-wmf.9/includes/MediaWiki.php(286): MediaWiki->performAction(Article, Title)
#24 /srv/mediawiki/php-1.27.0-wmf.9/includes/MediaWiki.php(731): MediaWiki->performRequest()
#25 /srv/mediawiki/php-1.27.0-wmf.9/includes/MediaWiki.php(506): MediaWiki->main()
#26 /srv/mediawiki/php-1.27.0-wmf.9/index.php(43): MediaWiki->run()
#27 /srv/mediawiki/w/index.php(3): include(string)
#28 {main}