For your problem:
- did you modify the module's title? In which case the title used in the article is no longer correct,
- did you override some code while editing the article? (check the source and make sure you still get the {})

Great to see that this license issue is finally sorted out.

I think you are focusing too much on what the page points to. It is common when there is an error: the framework just gives you the root of the site.
Right now there is nothing that tells me the module is the problem. Especially that you said it worked until you changed something else not related to the module.
So many things can go wrong: it may be the way the framework bhaves, the way the plugin used in the article works...
Now, to fix this issue, try and set the server option 'error reporting' in your Joomla! admin console to 'development'. Hopefully there will be an error that will help figuring out what is wrong.
Could you also please send me a screenshot of the 'basic options' (article selection part) and 'head: image options' tabs of the module?
I can only guess how your site is setup by what you tell me. The more info the better.
Thank you!

The problem may also be, hinted by the error message, the nesting of plugins.
For instance an article calling a loadmodule plugin which is an article calling another plugin...
The module allows the call to plugins so if you call the module from an article and that one of the articles in the module has also plugin calls inside it, then you get into nested plugins.
The loadmodule plugin may not allow nesting or the nesting goes into a loop and eventually crashes the page...