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
Errores reportados
"Datos XML del módulo no disponibles" cuando se va a editar el módulo (los campos no aparecen)
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).