Sitecore PXM InDesign is unable to load a project

When inside InDesign and attempting to load a Sitecore Print Experience Manager (PXM) project - via the Load the current item button, the project was not loading for me.

After looking into the printstudio.log older I noticed the following error:

ERROR Access to the path 'C:\inetpub\Jetstream\Website\Projects\sitecore\admin_a1wfr3ls\en\a9880262-14c3-4569-91d0-03aeaed946ed\' is denied.
ERROR BuildPublishXml Object reference not set to an instance of an object.

This was traced back to a setting inside Sitecore.PrintStudio.config - available in App_Config/Include/PXM. The PrintStudio.ProjectsFolder setting needs to be set to the PublishingCache folder rather than the default of projects. The correct setting should be something like: C:\inetpub\wwwroot\Jetstream\PXMPublishing\PublishingCache - which is the folder structure you created manually in the PXM installation.

This error may also trace back to permission/sharing of this folder depending on server/network architecture.