At the moment of wanting to register an article in crossref appears an error 500
Error 500 is not error in OJS. Please contact your hosting company and/or institution system administrators and ask them to check details according to this
In my experience, increase of memory and time of script execution solved problem. Those parameters can be increased by system administrators since they are located in php.ini in server.
Muchas gracias por la información, en verdad es de gran ayuda.
See also Actualización a 3.1.0-1.
Public Knowledge Project Team