Hi,
According to the latest fusion update video, there is a new feature that allows you to load a model of the machine so
that you can check for collisions with the cutting head with parts of the machine or the part due to the geometry the
cutting head needs to be at to make a cut.
This looks like an error related to that. I think that there are only limited models available in the library to do this
but that will change as more manufacturers create a model and pass it on to AutoDesk.
You should be able to just hit ok and do what you want, you will just not have that functionality available.
I don't think it is a critical error but if it is then it will be an AutoDesk fix.
Cheers
Andrew