Editar módulo muestraː datos XML del módulo no están disponibles
From Joomla! Documentation
Joomla!
3.4.0
Algunos de los módulos instalados en Joomla 3.4 y superior (que previamente trabajaba en Joomlaǃ 3.3.6), muestran un error al intentar editarse
Errors reported
"Module XML data not available" when going to edit module (with no fields appearing)
Versions affected
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).