PDF export Error

I’m receiving the following error when I’m trying to export a PDF: <status-code>500</status-code> <message>An error occurred during export. Threw exception org.apache.fop.apps.FOPException: /home/jira/.fop/fop-fonts.cache (No such file or directory)</message> <stack-trace>com.tempoplugin.exception.ExportException: An error occurred during export. Threw exception org.apache.fop.apps.FOPException: /home/jira/.fop/fop-fonts.cache (No such file or directory)

Why?

This mainly happen when the permission in SO (Linux) are not correct in the temporary folders. To be able to export a file in PDF format, JAVA process need the correct permission to create a "ghost” file.
So it is necessary confirm if the user that runs the Jira process has the read and write permission on tmp folder from the user itself and the Jira home folders.
If the user has the permissions and still cannot export, double check if the user is the owner of the folders.