Server error on camera calibration export

[anherm160]

Describe the bug
I'm getting a 500 error in when I try to export my camera calibration settings from the web client. I'm running the server (version 2025.2.1) on an OrangePi B, version. My camera is an Arducam_OV9871_USB.

To Reproduce
Steps to reproduce the behavior:

1. Connect client computer to OrangePi's network
2. Open web client at http://photonvision.local:5800/#/cameras and run through camera calibration
3. Navigate to the specific calibration result and click "Export"
4. Observe the spawned web page showing a black background and the text "Server error". In my case the URL is http://photonvision.local:5800/api/utils/getCalibrationJSON?width=1280&height=720&cameraUniqueName=arducam_ov9281_usb_camera

Expected behavior
I expect to either see or be able to download a JSON file containing my camera's calibration settings.

Screenshots
This is the browser error I see:

I looked at journal logs on the Orange Pi and found this null pointer exception:

Desktop (please complete the following information):
I think this is irrelevant, but here it is anyway.

• OS: Windows 11
• Project Information: WPILib Information:
  Project Version: 2025.3.1
  VS Code Version: 1.96.2
  WPILib Extension Version: 2025.3.1
  C++ Extension Version: 1.23.2
  Java Extension Version: 1.38.0
  Java Debug Extension Version: 0.58.1
  Java Dependencies Extension Version 0.24.1
  Java Version: 17
  Java Location: C:\Users\Public\wpilib\2025\jdk
  Vendor Libraries:
  libgrapplefrc (2025.0.8)
  maplesim (0.3.8)
  PathplannerLib (2025.2.5)
  CTRE-Phoenix (v5) (5.35.1)
  CTRE-Phoenix (v6) (25.3.1)
  photonlib (v2025.2.1)
  ReduxLib (2025.0.1)
  REVLib (2025.0.3)
  Studica (2025.0.1)
  ThriftyLib (2025.0.2)
  URCL (2025.0.1)
  WPILib-New-Commands (1.0.0)
  YAGSL (2025.7.1)

Additional context
Add any other context about the problem here.

[sciencewhiz]

Is there a reason you think this is a WPILib bug instead of a PhotonVision bug?

[spacey-sooty]

This looks to be a PhotonVision bug, if anyone has permissions to transfer the issue that would be good. If not it can be opened at https://github.com/PhotonVision/photonvision/issues

[awordforthat]

my mistake - I'll report it there.