I am confused on why the camera suddenly states that it is not a multi-view camera. It was working fine days before until now. I saw another forum that states adding another camera can be a solution. I tried that, not sure if I did it right. I would like a step by step guideline if possible. Thank you.
You need to do one of this:
1) Set Stereo 3D instead of Multi-View, if you want to use one camera
2) Or if you select Multi-View add as many cameras as you have views here:
and add a suffix to camera names from camera suffix setting. Like in my case, I have 2 views and set up 2 cameras: