rocketlauncher error

Hi, Justin. When I use the RocketLauncher to launch the rocket, I get the following error.

"ArgumentException: An item with the same key has already been added. Key: RocketLauncher (Instance) (UnityEngine.Material)"

Do you know what the reason is?
 
What is the full stack trace? Can you list how I can reproduce it within the demo scene?
 
What is the full stack trace? Can you list how I can reproduce it within the demo scene?
Hi, Justin. I am getting this error when using ‘Unity 2018.3.5f1 + UCC 2.1.4’.

I did a test in ’Unity 2019.2.0f1 + UCC 2.1.8‘ try to reproduce this error and found that this error is gone. So I think everything is fine now, I am going to use the new version of UCC, thank you for your reply.
 
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