Hi, im kinda new. I used Mediawiki verison 1.25.3. And i faced this problem which is Error: LightnCandy class not defined whenever im trying to upload file. Can someone help me.. Kinda desperate and in hurry.. huhuhh.. Thanks
Topic on Project:Support desk
This error should not happen, if you installed MediaWiki from an official tarball, which is built for "Upload-Install-Use". So, if all you want is version 1.25.x, then grab a recent tarball of it and make sure you actually uploaded all files.
If you in contrast want to do development with this wiki, then run composer update to get the latest dependencies. If you installed from Git, then you need to do some more steps to set up. The Git version is built for use on wmf wikis only. You can use it, but you need to know the risk and what to do if something doesn't work.
Interestingly, I have an old wiki (v 1.25.2) that has only recently started giving me this error. It's had years of use with no issues, but now I get this same error when I try to upload most file types. For some reason, the error does not occur with png and jpeg files. Very strange!