System Information
Operating system: Windows 10
Graphics card: AMD Radeon 5700 xt

Blender Version
Broken: 3.0.0 Steam release (recent one)
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error

I tried to use add on, "Radeon Prorender", but I cannot use this.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Here is the link where I followed the step.

https://radeon-pro.github.io/RadeonProRenderDocs/en/plugins/blender/installation.html

I followed all the steps(Including Radeon Material Library), I could add the add-on in the list of Blender.
but it shows error message when I clicked the check-box to use it.
Even though I remove this, it doesn't work.
After that, I wrote about this issue in AMD official support community but they said, the file doesn't have any bug or problem.
I want to know how to install and use this add-on.

This is the address where I downloaded the add-on

https://www.amd.com/en/support/kb/release-notes/rn-prorender-blender-v3-0

blenderReport01 for checking check-box to use.
blenderReport02 for removing the add on.

This is an address where I asked in AMD community service.
https://community.amd.com/t5/radeon-prorender-discussion/i-have-a-problem-about-installing-blender-prorender/m-p/499893#M400