[asheshouse]

If you have separate mods installed for ffb objects or canons objects try temporarily disabling them by putting - in front of the name.

Also check in static.ini for these lines

//===========================================================================
[***]
Title Canon Blank Field Plate
//===========================================================================
[buildings.Plate$BlankFieldPlate]
Title BlankFieldPlate
Mesh 3do/airfield/BlankFieldPlate/live.sim

Blankfieldplate should only appear once in the static.ini