How are you doing the backup/restore? did you backup your database and
re-download mediawiki? are the versions of PHP the same on both servers?

On Mon, Oct 25, 2021 at 4:28 PM Jingyi C. Shi <jshizh...@gmail.com> wrote:

> 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
>
>
> On Mon, Oct 25, 2021 at 7:02 AM <mediawiki-l-requ...@lists.wikimedia.org>
> wrote:
>
>>
>> Message: 2
>> Date: Mon, 25 Oct 2021 09:35:25 +0200
>> From: Andre Klapper <aklap...@wikimedia.org>
>> Subject: [MediaWiki-l] Re: Pages not showing with error messages
>> To: MediaWiki announcements and site admin list
>>         <mediawiki-l@lists.wikimedia.org>
>> Message-ID:
>>         <98b3b562efecc4af73a67f7582f69c2834b62b2d.ca...@wikimedia.org>
>> Content-Type: text/plain; charset="UTF-8"
>>
>> Hi,
>>
>> On Sun, 2021-10-24 at 23:55 -0500, Jingyi C. Shi wrote:
>> > I am restoring my mediawiki website on a new server. It happened this
>> > error:
>> > [4027854c] /dir/index.php/Welcome_to_MyWebsite MWException from line
>> > 1287 of /var/www/xxx/dir/includes/parser/Preprocessor_DOM.php:
>> > PPFrame_DOM::expand: Invalid parameter type
>>
>> Please see https://www.mediawiki.org/wiki/Manual:How_to_debug to get a
>> stacktrace and provide MediaWiki and PHP version information for both
>> servers.
>>
>> Thanks,
>> andre
>> --
>> Andre Klapper (he/him) | Bugwrangler / Developer Advocate
>> https://blogs.gnome.org/aklapper/
>>
>>
>>
> On Sun, Oct 24, 2021 at 11:55 PM Jingyi C. Shi <jshizh...@gmail.com>
> wrote:
>
>> Dear all,
>>
>> I am restoring my mediawiki website on a new server. It happened this
>> error:
>> [4027854c] /dir/index.php/Welcome_to_MyWebsite MWException from line 1287
>> of /var/www/xxx/dir/includes/parser/Preprocessor_DOM.php:
>> PPFrame_DOM::expand: Invalid parameter type
>>
>> Do you have any ideas? What does it indicate?
>> I look forward to any help. Thank you all!
>>
>> Best,
>> Catherine
>>
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