One object isn't getting lit and is just black

[stuck cloak]

I just started baked lighting so I don't know what to do could someone help?

[gritty sphinx]

Baked lightmapping has many steps, make sure you follow them all and use the debugging tools
https://docs.unity3d.com/6000.0/Documentation/Manual/Lightmapping-baking-before-runtime.html

Without knowing where in the process you got stuck or missed a step, it's not really possible to give any more specific advice