Random massive white light and black boxes in my game

[willow bramble]

Hi working on my game right now for a uni assignment thats due tomorrow and as i was finishing up on it it has these effects that i cant get rid of and i dont know what they are

[fast cradle]

This is most often a brighness(color intensity) value overflow.

Use the frame debugger to identify the culprit object/light source.

[grim lion]

Typically an error in a custom shader, or an error / corruption during lightmap generation
Depending on what you did that caused it to appear