Error: Python: RuntimeError: could not create instance of EXPORT_SCENE_OT_mitsuba to call callback function 'invoke'

[Wouter-Lemoine]

Bug Description
When exporting a basic file, this error occurs: Error: Python: RuntimeError: could not create instance of EXPORT_SCENE_OT_mitsuba to call callback function 'invoke'

To Reproduce

1. create a new file
   1a. (delete the light and camera)
2. Export the scene using file > export > Mitsuba (.xml)

Expected behavior
Exporting the file

Environment (please complete the following information):

• OS: 6.12.16-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.16-1 (2025-02-22) x86_64 GNU/Linux
• Blender Version: 4.4.0
• Add-on Version: [latest]

[hack03er]

Just a hint for anyone, that has this problem. I got it working with Blender 4.0.2.

[cyclehome]

I can confirm this error with Blender 4.4.3 and the latest add-on version on Windows.
Works with 4.3.2.
So 4.4 seems to break something.

Thanks a lot!