Why did analysis report an error
It’s a warning, not an error. Warnings are orange, errors are red.
(And even if a component throws a red error, it doesn’t necessarily mean there isn’t any useful output from that component).
At any rate, as the warning says, it doesn’t look like you used a fisheye image as input, and, as a result, the output MAY be inaccurate. If you are happy with the output, all is fine and you can disregard the warning. If you are not happy with the output, you should change the input.