OJS 3.1.1.4
Hello. we have a journal that use DOI:
Year.Number.IDintoissue
For example, i have number 2 with 3 articles
2018.2.01
2018.2.02
2018.2.03
Number 3 with 2 articles
2018.3.01
2018.3.02
I used this pattern in DOI plugin
%Y.%i.%x
But when i am going to assign a DOI, error
Thanks