Ressource planning PDF - by: dep@eca.fr

Hello, I have a problem when I want to create PDF file for ressource planning.
log file:
2017-04-06 09:34:35.404 ***** ERROR ***** ERROR *****
2017-04-06 09:34:35.404 ***** ERROR ***** on file '/var/www/projeqtor/tool/jsonResourcePlanning_pdf.php' at line (266)
2017-04-06 09:34:35.404 ***** ERROR ***** cause = Undefined index: validatedcost