This is probably caused by running out of memory. This could happen because of many reasons, and some of them include:
- Using displacement with high-quality settings in a high-resolution image (e.g. displacement screen size lower than the default 2 px, in a scene rendered in resolution higher than 1920 x 1080 px).
- Rendering large numbers of objects or detailed meshes (a "heavy" scene).
- Using many render elements (especially LightMix) within a high-resolution rendering.
For possible solutions, see: I am getting a sudden rise in RAM usage!
If the problem is caused by something else (for example, it disappears after deleting some object or material), please report it through our Support Portal.
See: How to report issues? (3ds Max | C4D)