This message is triggered when an internal Corona error occurs during rendering.
Something caused an internal error. It could be various things, so if the issue is reproducible, we will be able to investigate it and provide a solution, or at least a workaround, so that you can continue working with Corona.
To make sure this bug is fixed in the future, please report to us the specific error you are getting, and try to provide as much detail as possible, ideally including the scene where the error is reproducible. For more information on how to correctly report issues to us, see: How to report issues - 3ds Max