LIghting gaps between walls

I am rendering in cycles.

I do not know why there is a vertical light gap. This is one wall, not separate two walls. The texture is the same everywhere in this wall.

Lighting gaps… do you mean that the left side is darker? Not the tiny vertical (orange stripes), or?
It’s a bit hard to gues without knowing the rest of the setup. But could it be that a normal is flipped?
You can look at the face normals as follows:
FaceNormal
Al faces should look blue (or red, but then they are all flipped).
To flip a normal of a face: Edit mode, select face, press Alt+N flip normal.
Otherwise, can you share the blend file?

Thank you very much. I really appreciate your help. Like what you mentioned, my face orientaiton causes this problem. After I flip the wrong one, everything works. I also find other faces with wrong orientation. Without your help, I cannot find these wrong faces. Thank you very much.

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