"CrossRef XML Export Plugin" not working

Describe the issue or problem
I want to register my DOI manually but it isn’t working anymore. Automatic DOI registeration never worked for me.

Steps I took leading up to the issue

  1. Go to ‘Tool’ and then to ‘CrossRef XML Export Plugin’.
  2. Click ‘Articles’ and choose/click the articles whose XML file you want to Export (so later you can submit this file manually to Crossref)
  3. Earlier i used to get an XML file when i used to press ‘Export’ but today am seeing an error ‘The page isn’t working’
  4. Automatic DOI registration never worked for me, and today even manual system seems not working.

Application in use
OJS 3.3.0.11

Additional information
Screenshots attached here within.

Hi @zhao,

The HTTP ERROR 500 - that’s from your site, correct? That may indicate something going on on your server - could you check your PHP error log and report back on any errors you see there?

-Roger
PKP Team

(1) Yes, it’s our website.
(2) How/where can i see PHP error log?

Thanks

Hi @zhao,

See this post here for how to locate your PHP error log: How do I find my PHP error log?

-Roger
PKP Team

Hi @zhao,

If you are experiencing a new issue, can you please create a new post outlining the issue and explaining it in more detail (including what version you’re upgrading from and to)? We typically try to limit it to one post per issue, as per our guidelines, so let’s keep the topic of this post to the Crossref issue.

Thanks,

Roger

error-
[10-Jan-2023 01:52:57 America/Chicago] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /home3/thescien/publish.thescienceinsight.com/lib/pkp/lib/vendor/symfony/string/Resources/functions.php on line 14

I solved this problem on my own by unticking/uninstalling Crossref Reference Linking plugin. When you install this plugin you may face difficulty in downloading CrossRef XML Export file.