Error during viewing saved customer Invoices

Suddenly i have started getting an technical error during viewing invoices :

need help on this, can not find the reason
Thanks in advance

@Conedr8 did you find the reason?

I would look 2 places if I were you.

  1. the php log from your webserver
  2. the dolibarr.log file in the documents folder - if you enabled that in the module configuration