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Material error when double sided is turned on

Can someone help me with this error? When I turn on the 2-sided material, it doesn’t pick up light.!
I am using 3dsmax 2019.

Making material double-sided doesn’t cause the lightmap to be computed separately for the front and back sides. It just makes the material visible from both sides, but the back side uses the same lightmap information as the front side. This setting is meant mostly for thin surfaces, for which the front-back lighting difference can be ignored. For example, this is often the case with plant leaves.

If you want a wall to be visible from both sides, model is as two surfaces: one facing the building exterior, and one facing the interior.