# April Tag Setup Issues - Waiting for Server

Source: https://forum.modalai.com/topic/3411/april-tag-setup-issues-waiting-for-server
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2024-05-07 22:20:08 UTC by WineVirus
Replies: 2 · Views: 743

## WineVirus · 2024-05-07 22:20:08 UTC

Hi, I'm working on April Tag setup for the tracking camera (SDK 1.1.1, M0149 Camera). I've run through the ``` voxl-configure-tag-detector``` wizard, set to factory default, and enabled. I haven't changed anything with the other configuration files. My issue arises when I'm trying to check output, but ```voxl-inspect-tags``` is producing the following, without proceeding (tried waiting for +5 minutes, power cycled and waited again):
![ea495b7c-a3c8-463c-ac81-3700fe6a6084-image.png](https://forum.modalai.com/assets/uploads/files/1715119317093-ea495b7c-a3c8-463c-ac81-3700fe6a6084-image.png) 

I'm able to see the live tracking camera output via Voxl Portal, but it's not giving me anything indicating that it's picking up on the tag. 

![551264e4-fe6b-422b-96fd-eaaa5b2aff33-image.png](https://forum.modalai.com/assets/uploads/files/1715119810985-551264e4-fe6b-422b-96fd-eaaa5b2aff33-image.png)

## Reply by tom (ModalAI staff) · 2024-05-07 22:55:52 UTC

@WineVirus I would take a look at `journalctl -u voxl-tag-detector` to see the status of the server

Since it is still waiting for the MPA pipe to be created, I'm guessing the server is crashing

## Reply by Alex Kushleyev (ModalAI staff) · 2024-05-08 16:47:26 UTC (in reply to tom)

`vox-tag-detector` requires camera calibration, path to which which is stored here in the configuration file : `/etc/modalai/voxl-tag-detector.conf` . If you have not performed calibration of your tracking camera, please do that: https://docs.modalai.com/calibrate-cameras/

After that, make sure the `voxl-tag-detector.conf` is set up to listen to the correct camera (`input_pipe` should match the name of the camera that you are looking at through `voxl-portal`, typically `tracking` for the tracking caemra).  Also make sure the detector is enabled `"enable":	true` in `voxl-tag-detector.conf` .

Finally, as Tom suggested, if the tag detector encounters some error, it will display it in the log. You could just run the tag detector in the foreground by stopping the background service first and then running the detector in the terminal:
```
systemctl stop voxl-tag-detector
voxl-tag-detector
```