Bake Lightmap issue, UNITY 4 BETA7.

Bake Lightmap issue, UNITY 4 BETA7:

I get this issue when I try to lightmap Objects/GameObjects : the lightmapper won't do, displaying "Nothing to bake [...] Only static objects will be lightmapped...etc"

for sure I checked the box static, lightmap static, everything, generated Lightmap UV coordinates Everything right as usual. Note that I used to make it work previously with unity 3.5.x but now the same settings won't do with unity 4 beta7...

please can you help or confirm if this is a bug??

is there a solution?

edit: seems that my model made with SKETCHUP has a problem: debug log says "Secondary UV set on meshU3D is incorrect. Lightmapper needs UVs inside the [0,1]x[0,1] range. Skipping this mesh...
Choose the 'Generate Lightmap UVs' option in the Mesh Import Settings or provide proper UVs for lightmapping from your 3D modelling app.
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