Wiki

I have used dfwiki in my course using moodle 5.2 and the last version of dfwiki.
It works great, but I have a problem with the backup (or XML export)
I got the error message "Course Module ID was incorrect"  just after selecting the WIKI page to export (with export to XML). If I export only the data it works.
I have try to trace the error. It appears in the file   exportxml.php
and if I try to print  some more info with the modified php code
 
 optional_variable($id);    // Course Module ID
 optional_variable($path);
 optional_variable($file);
 optional_variable($type);

 if (! $cm = get_record("course_modules", "id", $id)) {
        error("Course Module ID was incorrect ($id,$path,$file,$type)");
                                                                 // ^^^^^^^^^^^^^^ print info
    }
I got the error message "Course Module ID was incorrect (,0,0,0)"
i.e. the variable $id is undifined, and the other variables are egal to 0

As I don't know the architecture of moodle, and how the variables are defined, I cannot go further. I have  checked the dfwiki  database, and the course id in the mdl_dfwiki is correct!
Have you any idea about this problem (that other people have also reported)

Nevertheless, thanks to all the developers of moodle
regards,  
Marc