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Hi, this is for those who can have the same problem I had. In my case the problem was that my file main.php located at content/module directory had an wrong character in the line 2:
define('_C_FILENOTFOUND','¡Archivo no encontrado! Por favor, verifica la URL.');
áso, as soon as I activated the debug the error was shown and I deleted it and it works!!. I can see all my submenu at first level and second level.
Thanks XOOPS comunity, excelente module!.
I am really happy..