'__relatorio_escape_invalid_chars(format_date(invoice.invoice_date or today,
invoice.party.lang))'>
File "/trytond/report/report.py", line 338, in format_date
lang = Lang.get()
File "/trytond/ir/lang.py", line 313, in get
('code', '=', code),
ValueError: not enough values to unpack (expected 1, got 0)
Fault: not enough values to unpack (expected 1, got 0)
You may fix this issue by setting the correct language in the configuration file or in the party - configuration - language
Kind regards,
Armand