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I am a Blender user, but these error messages have nothing to do with textures.
It seems to be a Python syntax error. Maybe the file you have been trying to render contains embedded Python elements and your 2019 Maya-Arnold combo uses a different Python version, causing syntax mismatch.
As the error seems to be caused by the camera list, you could try to delete every cameras, save the file with a new name, open it, create new cameras and try to render, or
export your model as fbx or obj, create a fresh scene with your Maya, import it back, then try to render.
Maya or Arnold forums could be much more helpful...
