Thank you, Andre!
Below is the stack trace I got.
[d7e9d262] /xxx/index.php/Welcome MWException from line 1287 of /var/www/xxx/includes/parser/Preprocessor_DOM.php: PPFrame_DOM::expand: Invalid parameter type
Backtrace:
#0 /var/www/xxx/includes/parser/Parser.php(3342): PPFrame_DOM->expand(NULL, integer)
#1 /var/www/xxx/includes/parser/Parser.php(645): Parser->replaceVariables(string, PPFrame_DOM)
#2 /var/www/xxx/includes/parser/Parser.php(5081): Parser->preprocess(string, Title, ParserOptions)
#3 /var/www/xxx/includes/cache/MessageCache.php(1020): Parser->transformMsg(string, ParserOptions, Title)
#4 /var/www/xxx/includes/Message.php(1129): MessageCache->transform(string, boolean, Language, Title)
#5 /var/www/xxx/includes/Message.php(797): Message->transformText(string)
#6 /var/www/xxx/includes/Message.php(860): Message->toString()
#7 /var/www/xxx/includes/OutputPage.php(958): Message->text()
#8 /var/www/xxx/includes/OutputPage.php(1005): OutputPage->setHTMLTitle(Message)
#9 /var/www/xxx/includes/page/Article.php(514): OutputPage->setPageTitle(string)
#10 /var/www/xxx/includes/actions/ViewAction.php(44): Article->view()
#11 /var/www/xxx/includes/MediaWiki.php(490): ViewAction->show()
#12 /var/www/xxx/includes/MediaWiki.php(287): MediaWiki->performAction(Article, Title)
#13 /var/www/xxx/includes/MediaWiki.php(714): MediaWiki->performRequest()
#14 /var/www/xxx/includes/MediaWiki.php(508): MediaWiki->main()
#15 /var/www/xxx/index.php(41): MediaWiki->run()
#16 {main}
The versions of the new server are:
CentOS 7
Apache/2.4.51
PHP 7.4.25
mysql Ver 8.0.23
MediaWiki version 1.26.2
As I am restoring from my backup files and the old server was down, I don't have the information about the old server.
Please let me know if more information is needed! Thank you and look forward to any further help!
Best,
Catherine