Internal error

[XtGTiSU7J44AAGFSuY0AAAAB] /index.php/Template:IPA Error from line 293 of /var/www/wiki/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php: Class 'Symfony\Component\Process\ProcessBuilder' not found

Backtrace:

#0 /var/www/wiki/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight.class.php(121): SyntaxHighlight::highlight(string, string, array)
#1 /var/www/wiki/includes/parser/Parser.php(3852): SyntaxHighlight::parserHook(string, array, Parser, PPTemplateFrame_DOM)
#2 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1314): Parser->extensionSubstitution(array, PPTemplateFrame_DOM)
#3 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1680): PPFrame_DOM->expand(DOMElement, integer)
#4 /var/www/wiki/includes/parser/Parser.php(3259): PPTemplateFrame_DOM->cachedExpand(string, PPNode_DOM)
#5 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1229): Parser->braceSubstitution(array, PPTemplateFrame_DOM)
#6 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1751): PPFrame_DOM->expand(DOMElement, integer)
#7 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1763): PPTemplateFrame_DOM->getNamedArgument(string)
#8 /var/www/wiki/extensions/Scribunto/engines/LuaCommon/LuaCommon.php(653): PPTemplateFrame_DOM->getArgument(string)
#9 /var/www/wiki/extensions/Scribunto/engines/LuaStandalone/LuaStandaloneEngine.php(449): Scribunto_LuaEngine->getExpandedArgument(string, string)
#10 /var/www/wiki/extensions/Scribunto/engines/LuaStandalone/LuaStandaloneEngine.php(426): Scribunto_LuaStandaloneInterpreter->callback(string, array)
#11 /var/www/wiki/extensions/Scribunto/engines/LuaStandalone/LuaStandaloneEngine.php(474): Scribunto_LuaStandaloneInterpreter->handleCall(array)
#12 /var/www/wiki/extensions/Scribunto/engines/LuaStandalone/LuaStandaloneEngine.php(350): Scribunto_LuaStandaloneInterpreter->dispatch(array)
#13 /var/www/wiki/extensions/Scribunto/engines/LuaCommon/LuaCommon.php(288): Scribunto_LuaStandaloneInterpreter->callFunction(Scribunto_LuaStandaloneInterpreterFunction, Scribunto_LuaStandaloneInterpreterFunction)
#14 /var/www/wiki/extensions/Scribunto/engines/LuaCommon/LuaCommon.php(936): Scribunto_LuaEngine->executeFunctionChunk(Scribunto_LuaStandaloneInterpreterFunction, PPTemplateFrame_DOM)
#15 /var/www/wiki/extensions/Scribunto/common/Hooks.php(138): Scribunto_LuaModule->invoke(string, PPTemplateFrame_DOM)
#16 /var/www/wiki/includes/parser/Parser.php(3383): ScribuntoHooks::invokeHook(Parser, PPTemplateFrame_DOM, array)
#17 /var/www/wiki/includes/parser/Parser.php(3106): Parser->callParserFunction(PPTemplateFrame_DOM, string, array)
#18 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1229): Parser->braceSubstitution(array, PPTemplateFrame_DOM)
#19 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1680): PPFrame_DOM->expand(DOMElement, integer)
#20 /var/www/wiki/includes/parser/Parser.php(3259): PPTemplateFrame_DOM->cachedExpand(string, PPNode_DOM)
#21 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1229): Parser->braceSubstitution(array, PPFrame_DOM)
#22 /var/www/wiki/includes/parser/Parser.php(2921): PPFrame_DOM->expand(DOMElement, integer)
#23 /var/www/wiki/includes/parser/Parser.php(1277): Parser->replaceVariables(string)
#24 /var/www/wiki/includes/parser/Parser.php(451): Parser->internalParse(string)
#25 /var/www/wiki/includes/StubObject.php(111): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#26 /var/www/wiki/includes/StubObject.php(137): StubObject->_call(string, array)
#27 /var/www/wiki/includes/content/WikitextContent.php(329): StubObject->__call(string, array)
#28 /var/www/wiki/includes/content/AbstractContent.php(516): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#29 /var/www/wiki/includes/poolcounter/PoolWorkArticleView.php(144): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#30 /var/www/wiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#31 /var/www/wiki/includes/page/Article.php(585): PoolCounterWork->execute()
#32 /var/www/wiki/includes/actions/ViewAction.php(68): Article->view()
#33 /var/www/wiki/includes/MediaWiki.php(499): ViewAction->show()
#34 /var/www/wiki/includes/MediaWiki.php(293): MediaWiki->performAction(Article, Title)
#35 /var/www/wiki/includes/MediaWiki.php(851): MediaWiki->performRequest()
#36 /var/www/wiki/includes/MediaWiki.php(523): MediaWiki->main()
#37 /var/www/wiki/index.php(43): MediaWiki->run()
#38 {main}