Bearbeiten von Modul zeigt "Module XML data not available"

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Some modules installed in Joomla 3.4 and higher (that previously worked in Joomla 3.3.6) show an error when attempting to edit

Errors reported

"Module XML data not available" when going to edit module (with no fields appearing)

Versions affected

Info non-talk.png
General Information

This pertains only to Joomla! version(s):- 3.4 and higher

What is the cause

Modules that have capital letters in their elements are now forced to lowercase during module installs (as a result of some standardisation in the installer). This results in case sensitive systems with the XML file being unable to be found.

How to fix

Ensure the module element e.g.

<filename module="mod_articles_category">mod_articles_category.php</filename>

has no capital letters in (as well as the appropriate XML file).