Hi All, I've had this issue on 1.0.7 too.
So far, I have been able to bypass the error to get BTV and autoland operational by simply "resetting" the ZFW on the Fuel&Load page of the active FMS
To "reset" ZFW, just click the field box and hit "enter" without typing in any values.
If you're using SimBrief, you may also need to reimport your loadsheet from SimBrief before "resetting" the ZFW via the FMS.
Hope it helps!