Unknown cause of Power Pivot error message

Hi,
We are in the process of upgrading office from 2013 to 2016. On all 2016 computers I am getting the following error when refreshing any power pivot table. (works fine in 2013).

data model error message.PNG

I have no idea how to investigate this or what the issue may be causing this.

Many Thanks
Richard

No idea about that message eiter but did you try if the error also happens when you create a fresh 2016 PowerPivot File?