https://www.mediawiki.org/wiki/Manual:How_to_debug

[memcached] MainWANObjectCache using store MemcachedPhpBagOStuff

This is all the error logs, It's added to your troubles.

(Hi, please use the preview before posting comments to check the format. The output above is hard to read, unfortunately.)

Please also provide both your exact MediaWiki version and extension version/branch. Please see https://www.mediawiki.org/wiki/How_to_report_a_bug - thanks.

OK,I know.

1.Go to http://wiki.lclightcat.com/ with Microsoft Edge.
2.Try to create an account（button“创建账户”）

After you do this (after you click the Create Account button), you will see an error prompt and the debugger has been opened.

Thanks.

In addition: the language is simplified Chinese

In addition: it should be noted that any behavior of calling the database will cause this error. After clicking the login button, the user has not logged in.

Please see T269994#6686430 - thanks.

In T269994#6686431, @LClightcat wrote:

1.Go to http://wiki.lclightcat.com/

Impossible:

$:acko\> wget http://wiki.lclightcat.com/
--2020-12-12 14:43:04--  http://wiki.lclightcat.com/
Resolving wiki.lclightcat.com (wiki.lclightcat.com)... 120.53.230.57
Connecting to wiki.lclightcat.com (wiki.lclightcat.com)|120.53.230.57|:80... connected.
HTTP request sent, awaiting response... No data received.
Retrying.

Please provide requested information here, in this ticket. Thanks.

I'd say you didn't follow the installation instructions of that extension. Or at least, you're missing the "run the update.php script"

It seems that your operation was temporarily blocked as a kind of penetration behavior by my firewall(your operation is considered as an attack and is blocked), so your access failed at that time. In addition, this is the second installation, the first time I even imported it manually.Also, the firewall is closed. Please try again. I'm sorry for the trouble.