Cannot open the sun panel and material panel

I have been using Rhino 6. I could open the panels for sun and materials before, but the pannels do not appear when I clicking on their icons now. The command history said: Choose sun option ( ShowPanel=Yes Options DateAndTime Location ) .
Please help to solve this problem?
Thank you!

In Tools » Options » Plug-ins ensure Renderer Development Kit and Renderer Development Kit UI and RDK_EtoUI are enabled and loaded.

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Thank you!

how do i load rdk_etoui?