According to the link you provided, there are no errors showing on my end.
There is also malware called JLIB .EXE (note the space before the period) which is a worm that might be infecting your computer, which is probably why I don't see any errors on your website.
But JLIB_FILESYSTEM_DELETE_FAILED is a constant in the language file, and the constant should be generating an error message telling you what file failed to delete. This is the line in the en-GB.lib_joomla.ini file -
What has to happen to make this error appear? It's possible it's just telling you that a file in the tmp directory is not deleted, which won't affect the operation of the website. So knowing what file wasn't deleted will help to tell if it's a problem or not.
If some other action is causing it, there could be a bug in Joomla. Knowing exactly how to recreate it will most likely give some clue as to how to prevent it, and whether it's actually the result of any harm. Just because you are getting a warning doesn't mean anything bad will happen. If it says Fatal Error - that's serious.
If you can figure out how to make it appear let us know.
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1 year 1 month ago #45793