SDfusion give error when try to export model

[Dines97]

Can I just paste here my question from stackoverflow?
SDFusion still supporting?

[Dines97]

https://stackoverflow.com/questions/53399546/exporting-sdf-model-from-autodesk-fusion-360

[missxa]

It looks like there is a problem with the number of rigid groups. How many do you have? Note that your design should have all the links broken (to other designs)

You can debug the SDFusion script directly from Fusion 360, maybe you can look at the variables values where the exception is thrown

[Dines97]

I am not very familiar with Fusion 360. The robot model is being developed by another group. So I decided to just export a simple cube model. Simple cube. The same error. What am I doing wrong?