Help! I cant paint materials in 3d space on my meshes

I cant paint materials on my mesh anymore. When i try to paint in 3d space on my mesh that i painted on before just fine it appears an error saying missing textures. What does textures have to do with this?? Help pls im new to blender. I know its not much to go off but maybe they have simply changed something in blender.

maybe you’ve opened a texture at one point and forgotten to close it?