Could not generate specification when exporting the model to an NBS Create specification

Issue

When you export the Autodesk Revit model to NBS Create the export fails with the error “could not generate specification”.

You will see the Plug-in connecting to the database

Then you will get this message

Cause

This can be caused by two issues:

1. You do not have the latest version of the NBS plug-in installed.
   

   Check you have the latest version by running the diagnostics. In Autodesk Revit click on the NBS menu > Support > About > Diagnostics > Run Tests. Download the latest version

2. You do not have permission to C:\Users\[username]\AppData\Local\Temp\NBSPluginData on that PC.
   During the export the plug-in writes files to this folder. If the user trying to export does not have 'modify' permission to this folder the export will fail.