The error may still be from a fill not in the drawing. The object is searching for a number of a fill by default and if there is no fill assigned to the number, will return an error message. To check the fills by their assigned number, look in the attribute manager and the list under the fills tab will have the assigned number shown.
Some of the common fill numbers that need to be used in a project from my findings are #22, #85, and I beleive the ones you need are #19, #73, and #28. To verify, place the object on the plan and opening the settings window. Look under the parameters, 3D Repersentation, and see if any of the fill designations are shown as missing. Create or import by appending fills with these numbers and the errors should go away. If they still have errors, other number fills may be needed as well.
Good luck.