In T349869#9451124, @BPirkle wrote:

The error is:

In T349869#9387217, @Atieno wrote:

@hyperreview have you managed to replicate this locally..?

In T325987#8514470, @Aklapper wrote:

@hyperreview: This sounds like a very good topic for the wikitech-l mailing list. I personally agree that there are [too] many communication venues.

I've solved the previous issue but now I have another problem with a dependency not being loaded by webpack (TypeScript recognize the dependency and compile, but at runtime Select2 is not recognized)

In T326468#8506478, @RPI2026F1 wrote:

Are you trying to load this through nodeJS? You need to compile it down to JS and load it through mw.loader.load(url) on a website of a Wikipedia.

In T325987#8491351, @Aklapper wrote:

Hi @hyperreview. This does not sound like a bug report about the code base but like a support request (how to do something, etc.).
As Wikimedia Phabricator is for bug reports, enhancement requests, and planning work, please check https://www.mediawiki.org/wiki/Communication . Thanks for your understanding!

Thank you very much, renaming the files worked.

This is the error message:
{"message":"Error: exception of type TypeError: Argument 2 passed to Wikimedia\\Parsoid\\Wt2Html\\TT\\ListHandler::pushList() must be an instance of stdClass, instance of Wikimedia\\Parsoid\\NodeData\\DataParsoid given, called in /home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ListHandler.php on line 518","exception":{"id":"75eef8c5bc9f4b5c1ab47588","type":"TypeError","file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ListHandler.php","line":304,"message":"Argument 2 passed to Wikimedia\\Parsoid\\Wt2Html\\TT\\ListHandler::pushList() must be an instance of stdClass, instance of Wikimedia\\Parsoid\\NodeData\\DataParsoid given, called in /home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ListHandler.php on line 518","code":0,"url":"/rest.php/www.tematichedigenere.com/v3/page/html/Cosa_c%27%C3%A8_da_fare%3F/27246","caught_by":"other","backtrace":[{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ListHandler.php","line":518,"function":"pushList","class":"Wikimedia\\Parsoid\\Wt2Html\\TT\\ListHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ListHandler.php","line":269,"function":"doListItem","class":"Wikimedia\\Parsoid\\Wt2Html\\TT\\ListHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ListHandler.php","line":85,"function":"onListItem","class":"Wikimedia\\Parsoid\\Wt2Html\\TT\\ListHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TT/TokenHandler.php","line":150,"function":"onTag","class":"Wikimedia\\Parsoid\\Wt2Html\\TT\\ListHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php","line":132,"function":"process","class":"Wikimedia\\Parsoid\\Wt2Html\\TT\\TokenHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php","line":195,"function":"processChunk","class":"Wikimedia\\Parsoid\\Wt2Html\\TokenTransformManager","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/TreeBuilder/TreeBuilderStage.php","line":487,"function":"processChunkily","class":"Wikimedia\\Parsoid\\Wt2Html\\TokenTransformManager","type":"->"},{"function":"processChunkily","class":"Wikimedia\\Parsoid\\Wt2Html\\TreeBuilder\\TreeBuilderStage","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php","line":903,"function":"current","class":"Generator","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php","line":180,"function":"processChunkily","class":"Wikimedia\\Parsoid\\Wt2Html\\DOMPostProcessor","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php","line":308,"function":"parseChunkily","class":"Wikimedia\\Parsoid\\Wt2Html\\ParserPipeline","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Wikitext/ContentModelHandler.php","line":123,"function":"parse","class":"Wikimedia\\Parsoid\\Wt2Html\\ParserPipelineFactory","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Parsoid.php","line":172,"function":"toDOM","class":"Wikimedia\\Parsoid\\Wikitext\\ContentModelHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/src/Parsoid.php","line":210,"function":"parseWikitext","class":"Wikimedia\\Parsoid\\Parsoid","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/extension/src/Rest/Handler/ParsoidHandler.php","line":587,"function":"wikitext2html","class":"Wikimedia\\Parsoid\\Parsoid","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/vendor/wikimedia/parsoid/extension/src/Rest/Handler/PageHandler.php","line":88,"function":"wt2html","class":"MWParsoid\\Rest\\Handler\\ParsoidHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/includes/Rest/Router.php","line":414,"function":"execute","class":"MWParsoid\\Rest\\Handler\\PageHandler","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/includes/Rest/Router.php","line":338,"function":"executeHandler","class":"MediaWiki\\Rest\\Router","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/includes/Rest/EntryPoint.php","line":168,"function":"execute","class":"MediaWiki\\Rest\\Router","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/includes/Rest/EntryPoint.php","line":133,"function":"execute","class":"MediaWiki\\Rest\\EntryPoint","type":"->"},{"file":"/home/251650.cloudwaysapps.com/wyvytmmgmu/public_html/rest.php","line":31,"function":"main","class":"MediaWiki\\Rest\\EntryPoint","type":"::"}]},"httpCode":500,"httpReason":"Internal Server Error"}

In my case the REAL error isn't 500 but what's behind it and seems to be:

As a developer I can't understand how a so diffuse problem still has a so unclear message...

I'm having the same issue too, this is the wiki: https://www.tematichedigenere.com/wiki/Pagina_principale
And here I've opened a discussion on StackOverflow https://stackoverflow.com/questions/73238686/mediawiki-trying-to-investigate-visualeditor-error-contacting-the-parsoid-rest

Hi @Aklapper thanks for the fast help. I tried sometimes asking on StackOverflow but with very low success, in IRC but low success as well, the MediaWiki Support Desk would be suitable for such a technical developer question?

I'm a software developer (I've experience with Git and SVN), how can I collaborate to fixing these bugs?

In T197868#7614475, @Lwangaman wrote:

@hyperreview did you try this?

In T197868#6557406, @Lwangaman wrote:

I had the same error message Error from line 35 of /var/www/mediawiki/extensions/Wikibase/lib/WikibaseLib.entitytypes.php: Class 'Wikibase\DataModel\Entity\ItemId' not found when trying to run the update.php script after an upgrade of my wiki from 1.34 to 1.35. Turns out it wasn't so much a composer problem, as it was that I simply hadn't run

git submodule update --init --recursive

in the extensions/Wikibase directory. I had git cloned Wikibase from branch REL1_35, but then you need to run git submodule update in the Wikibase extension folder and then after that run composer update --no-dev.

So what is the solution?

The error message itself is smelly code, it's very unclear and hard to troubleshoot, it should be: "the rest service isn't well configured" maybe.
And there are plenty of threads which could be something good for a StackOverflow user, not for a MediaWiki user.