An XML validation error occurred and the XML could not be exported

[Muhammad_Al_Madani]

Hi All

The solution to this problem, please go to the following file location:

ojsinstallation/plugins/generic/crossref/CrossrefPlugin.php

After that, please edit and find it on line 284.

Change null to true, as in the example image below:

I hope this method can help

Regards
Almadani