# ERROR: failed to start modalai vision lib

Source: https://forum.modalai.com/topic/132/error-failed-to-start-modalai-vision-lib
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: flight-deck
Posted: 2021-02-15 15:59:41 UTC by Pavel Ardashov
Replies: 6 · Views: 1780

## Pavel Ardashov · 2021-02-15 15:59:41 UTC

Hi, voxl-vision-px4 error
![787a5079-eff9-472e-abfc-2542c0a4b52b-image.png](https://forum.modalai.com/assets/uploads/files/1613404745812-787a5079-eff9-472e-abfc-2542c0a4b52b-image.png) 
tell me what could be the reason?

## Reply by Chad Sweet (ModalAI staff) · 2021-02-15 16:12:29 UTC

Do you have another process using the tracking camera? It looks like it cannot open the tracking camera.

## Reply by Pavel Ardashov · 2021-02-15 16:16:29 UTC (in reply to Chad Sweet)

@Chad-Sweet Launching on the VOXL Flight Deck I just received. Turned on, passed the wizard and get this error.
What else can a tracking camera use?

## Reply by Chad Sweet (ModalAI staff) · 2021-02-15 16:38:30 UTC

It would have shipped with everything tested and working. What do you mean by "passed the wizard"?

## Reply by Pavel Ardashov · 2021-02-15 18:14:44 UTC (in reply to Chad Sweet)

@Chad-Sweet when connecting QGC, there was no odometry in the mavlink inspector. After that I ran voxl-configure-modalai-vl

## Reply by Pavel Ardashov · 2021-02-16 09:26:51 UTC (in reply to Chad Sweet)

@Chad-Sweet now the odometry data is in the mavlink inspector, but x and y = 0
![39c9667f-7a89-4193-b035-e95edc97cc81-image.png](https://forum.modalai.com/assets/uploads/files/1613467602049-39c9667f-7a89-4193-b035-e95edc97cc81-image-resized.png)

## Reply by James Strawson (ModalAI staff) · 2021-02-16 23:39:44 UTC

Hello, When you ran the wizard, what did you enter for the camera configuration question, it should have been option 3 (hires+stereo+tracking) for a flight deck.

Do you mind running voxl-vision-px4 manually in odometry debug mode to see if VIO is working and share the output? You can use this command:

voxl-vision-px4 --debug_odometry

Thanks!