Online demo crashes with error message

[Jim U]

When clicking the demo link (https://www.qfsw.co.uk/demos/QC/) the application did not load on my first attempt to visit the page. My browser displayed this error message:

www.qfsw.co.uk says

An error occurred running the Unity content on this page. See your browser Javascript console for more info. The error was: Uncaught ReferenceError: UnityProgress is not defined

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Refreshing the page seems to have fixed it. It seems like once the application has been loaded

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I am running:

• Windows 10 Pro x64 1909 18363.959
• Google Chrome Version 84.0.4147.135 (Official Build) (64-bit)

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[Yusuf Ismail]

I’ve just tried this on the following browsers

• Chrome
• Edge
• Opera
• Firefox
• IE

All but IE worked without issue (IE does not support WebGL)

Tested on Windows 10 home

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Perhaps I should mark this issue as invalid until it can be further reproduced?

[Jim U]

In the screenshot I posted the inspector shows the server returned 520 (unknown error) for a request for file “UnityProgress.js”. If you have access to the web server error logs, it might have a clue to why the file request failed.

[Jim U]

So it seems more likely a web server issue to me, rather than anything to do with unity

[Yusuf Ismail]

Haven't been able to find anything that could have caused it, so closing for now. Will re-open it if something happens again