CrossRef Plugin Submission Error for OJS 3.1.1


I am using OJS 3.1.1, and suddenly I started to receive the following error when I submit DOIs manually.


I am not sure if this is a server-related issue.
Is there any idea about the possible source of this issue ?



Hello @zaratushtra!

First, I recommend that you check your Crossref login credentials to make sure they are entered correctly.

Secondly, please check out the following thread:

As well as this post:

It may be that you will need to upgrade your OJS to a higher version.

1 Like

Hi @EmmaU,

Thanks for your answer.
My login credentials are correct. But it seems like the thread you have referred to is exactly the problem I am facing now.