Usage of deepstream-test4-app with USB camera

I would like to use the deepstream-test4-app with USB camera through kafka server and I achieved it with DeepStream 5.0 Developer Preview for Jetson. However, I could not have done it with the newest version of DeepStream 5.0 for Jetson even though I used the same commands as successful one.

Here is the error message:
One element could not be created. Exiting.

**• Hardware Platform : TX2 and JAX
**• DeepStream Version : DeepStream 5.0 for Jetson
**• JetPack Version : Jetpack 4.4 [L4T 32.4.3]
**• TensorRT Version : 7.1.3.0
**• Issue Type : questions and bugs

Please specify details about your issues.

I found out the cause that is what msgconv element could not be created but, I could have generated it when I used the DeepStream 5.0 DP.
When I utilized the DeepStream 5.0 GA, this issue happens.

I found that msgconv element could not be created when I used not the DeepStream 5.0 DP but DeepStream 5.0 GA.
However, I don’t know the issue happens. So, could you please support to fix it?

It should not happen, msgconv element could not be created, please check your environments. clear the cache, and try again.
rm .cache/gstreamer-1.0/ -rf