# Error while voxl-logger --cam stereo -cam dfs_disparity

Source: https://forum.modalai.com/topic/2757/error-while-voxl-logger-cam-stereo-cam-dfs_disparity
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2023-10-19 22:36:48 UTC by José Quintanilla
Replies: 0 · Views: 393

## José Quintanilla · 2023-10-19 22:36:48 UTC

I'm trying to use the obstacle avoidance for a proyect but I got some errors, the more recent one is this one
![Screenshot from 2023-10-19 16-24-33.png](https://forum.modalai.com/assets/uploads/files/1697754818598-screenshot-from-2023-10-19-16-24-33.png) 

I try following this guide:https://docs.modalai.com/voxl-vision-px4-collision-prevention-0_9/
But I couldn't get through this part: Debugging Collision Prevention

But even though I decided to enable the voa to qgc and my drone keeps connecting and disconnecting and when I activate the obstacle avoidance its says I have an error in the pre arm check and the obstacle avoidance it's not ready