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- When you migrate from RenderMan 20.x to 21.x, you cannot use Pxr Std lights (which are RSL lights). Create a new Pxr C++ light. See Adding Light.
- After you add Pxr C++ lights and get error. Check your rendermn.ini and make sure you don't have turned off. For C++ lights to work, it needs to be turned on. It is on by default.
- Since there have been improvements, it is recommended to create a new RenderMan RIS ROP to avoid any unexpected errors.