I haven't tried it yet, but if you know the file with the problem, look at the line number in question.
The first character in the line sets the type of DRAW command. The latest KiCad eeschema allows for types "A" (Arc), "C" (Circle), "T" (Text), "S" (Square), "X" (Pin Description), "P" (Polyline), and "B" (Bezier Curve).
If it is none of these you get the error message.
Some builds lost the Bezier curve ("B") option, but I know the latest build I posted in the forum does have it.
Richard.