There is something that UI cannot figure out about the error message of one specific user.
After lots of tests this looks to be singular hopfully but It is meaning that it can appear again. So can you help me and give me some ideas
Lets connect to :
www.monbilansportsante.fr/index.php/votre-bilan/search?lastname=vga
And select the first proposition " MSS-VGA Sport Sante " = > you have an error 404. That is not the case with other users or other research ....