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When editing a page in the mediawiki namespace, I've the following error message

Warning: dba_open(/translate_messageindex.cdb.tmp.1708049930) [function.dba-open]: failed to open stream: Permission denied in /var/www/wiki/includes/Cdb.php on line 121

Unable to open DB file for write "/translate_messageindex.cdb"

Backtrace:

#0 /var/www/wiki/includes/Cdb.php(62): CdbWriter_DBA->__construct('/translate_mess...')
#1 /var/www/wiki/extensions/Translate/utils/MessageIndexRebuilder.php(42): CdbWriter::open('/translate_mess...')
#2 /var/www/wiki/extensions/Translate/TranslateUtils.php(205): MessageIndexRebuilder::execute()
#3 /var/www/wiki/extensions/Translate/TranslateUtils.php(177): TranslateUtils::messageIndex()
#4 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(267): TranslateUtils::messageKeyToGroup(8, 'Common.js')
#5 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(248): TranslateEditAddons::getMessageGroup(8, 'Common.js')
#6 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(279): TranslateEditAddons::getKeyCodeGroup(Object(Title))
#7 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(122): TranslateEditAddons::editBoxes(Object(EditPage))
#8 [internal function]: TranslateEditAddons::addTools(Object(EditPage))
#9 /var/www/wiki/includes/Hooks.php(133): call_user_func_array(Array, Array)
#10 /var/www/wiki/includes/EditPage.php(1179): wfRunHooks('EditPage::showE...', Array)
#11 /var/www/wiki/includes/EditPage.php(486): EditPage->showEditForm()
#12 /var/www/wiki/includes/EditPage.php(351): EditPage->edit()
#13 /var/www/wiki/includes/Wiki.php(523): EditPage->submit()
#14 /var/www/wiki/includes/Wiki.php(67): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#15 /var/www/wiki/index.php(117): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#16 {main}
Récupérée de « http://localhost/wiki/index.php/MediaWiki:Common.js »
Affichages

Original exception: exception 'MWException' with message 'Unable to open DB file for write "/translate_messageindex.cdb"' in /var/www/wiki/includes/Cdb.php:123
      Stack trace:
      #0 /var/www/wiki/includes/Cdb.php(62): CdbWriter_DBA->__construct('/translate_mess...')
      #1 /var/www/wiki/extensions/Translate/utils/MessageIndexRebuilder.php(42): CdbWriter::open('/translate_mess...')
      #2 /var/www/wiki/extensions/Translate/TranslateUtils.php(205): MessageIndexRebuilder::execute()
      #3 /var/www/wiki/extensions/Translate/TranslateUtils.php(177): TranslateUtils::messageIndex()
      #4 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(267): TranslateUtils::messageKeyToGroup(8, 'Common.js')
      #5 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(248): TranslateEditAddons::getMessageGroup(8, 'Common.js')
      #6 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(279): TranslateEditAddons::getKeyCodeGroup(Object(Title))
      #7 /var/www/wiki/extensions/Translate/TranslateEditAddons.php(122): TranslateEditAddons::editBoxes(Object(EditPage))
      #8 [internal function]: TranslateEditAddons::addTools(Object(EditPage))
      #9 /var/www/wiki/includes/Hooks.php(133): call_user_func_array(Array, Array)
      #10 /var/www/wiki/includes/EditPage.php(1179): wfRunHooks('EditPage::showE...', Array)
      #11 /var/www/wiki/includes/EditPage.php(486): EditPage->showEditForm()
      #12 /var/www/wiki/includes/EditPage.php(351): EditPage->edit()
      #13 /var/www/wiki/includes/Wiki.php(523): EditPage->submit()
      #14 /var/www/wiki/includes/Wiki.php(67): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
      #15 /var/www/wiki/index.php(117): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
      #16 {main}

      Exception caught inside exception handler: exception 'MWException' with message 'Unable to open DB file for write "/translate_messageindex.cdb"' in /var/www/wiki/includes/Cdb.php:123
      Stack trace:
      #0 /var/www/wiki/includes/Cdb.php(62): CdbWriter_DBA->__construct('/translate_mess...')
      #1 /var/www/wiki/extensions/Translate/utils/MessageIndexRebuilder.php(42): CdbWriter::open('/translate_mess...')
      #2 /var/www/wiki/extensions/Translate/TranslateUtils.php(205): MessageIndexRebuilder::execute()
      #3 /var/www/wiki/extensions/Translate/TranslateUtils.php(177): TranslateUtils::messageIndex()
      #4 /var/www/wiki/extensions/Translate/utils/ToolBox.php(17): TranslateUtils::messageKeyToGroup(8, 'Common.js')
      #5 [internal function]: TranslateToolbox::toolboxAllTranslations(Object(MonoBookTemplate))
      #6 /var/www/wiki/includes/Hooks.php(133): call_user_func_array(Array, Array)
      #7 /var/www/wiki/skins/MonoBook.php(322): wfRunHooks('SkinTemplateToo...', Array)
      #8 /var/www/wiki/skins/MonoBook.php(184): MonoBookTemplate->toolbox()
      #9 /var/www/wiki/includes/SkinTemplate.php(490): MonoBookTemplate->execute()
      #10 /var/www/wiki/includes/OutputPage.php(1171): SkinTemplate->outputPage(Object(OutputPage))
      #11 /var/www/wiki/includes/Exception.php(164): OutputPage->output()
      #12 /var/www/wiki/includes/Exception.php(191): MWException->reportHTML()
      #13 /var/www/wiki/includes/Exception.php(289): MWException->report()
      #14 /var/www/wiki/includes/Exception.php(348): wfReportException(Object(MWException))
      #15 [internal function]: wfExceptionHandler(Object(MWException))
      #16 {main}