object size in lightmap has reached the max atlas size

Hi,
I get this message on a concrete beam In a scene I’m light mapping, the beam has a 1024x1024 texture map that is repeated along its length, is this the reason I get this message ? And is there a solution ?

Thanks.

You have set a large value for the light map scale value for this object. With this value your object would generate a light map bigger than the max allowed size (4096x4096) and a lightmap for one object can be splitted, so it’s an impossible operation. Reduce your lightmap scale for this particular object.

Hello! Where do I find the Atlas Size option? I need to set it bigger for my terrain its so big… Im using 5.6.2f1