Lost bloom after delete Post Process Volume


I have added a Post Process Volume, checked Bloom, set its Intensity to 0.0, all get dark.

After that, I unchecked Bloom, but all is still dark. I have checked again, set its intensity to 1.0. All it is still dark.

Then, I have delete Post Process Volume, and all is still dark!!

I have some objects with a Emissive color material, but after that, there isn’t any emissive color.

Any idea what is it happening this?