In stylesheets/content/member/member-organizationChart.xsl it is mentioned into a comment. Probably as a suggestion.
Instead of this :
ametys:resourcesByPath('charte/picto/profils')/resource[@name = 'picto-1.png']/@id
suggest that :
ametys:resourceByPath('charte/picto/profils/picto-1.png')/@id