Hello.
I have the same issue and the same message
" Whoops, looks like something went wrong.
1/1
UndefinedMethodException in ps_emailalerts.php line 552:
Attempted to call an undefined method named "getLocale" of class "Language".
Did you mean to call "getLocaleByIso"?
in /home/tribekar/public_html/modules/ps_emailalerts/ps_emailalerts.php line 552"
I guess that the issue is comming from the language, translation. Maybe something is connected to this as I "play" with those options ...
I also install a new Cash on delivery module, available and I have the same behavior.
The order is not finalized.
I REALLY appreciate any help.