i have the same problem.
i tried this solution: i cant put the link because i dont have 20 karma so here is the domain instead:
put this in the browser after .com /forum/help-1/error-upon-printing-invoice-212287
but i wouldn't know where to put the two 't-att-data-oe-model' and 't-att-data-oe-id' ' in my code
i tried and placed every where but still the problem won't go away.
here is my codes:
template file:
session_templates.xml
session_reports.xml
Session Info
session
qweb-pdf
open_academy.session_templates
open_academy.session_templates
('Course-'+object.course_id.title+
'_'+'Session-'+object.name+'.pdf')
report