When I tried to calculate a contour of sound levels, NMPlot outputs an “invalid floating point error” and then halts contour calculations. What is causing this?

• In Version 1.1: I took care of the “Out of Memory” problem, but now when I run NMPlot, I receive a FATAL ERROR message about the file format created by Noisemap not being the one expected by NMPlot. I had already downloaded NMPLOTX.EXE Version 3.06, so I don’t think that’s the problem. Is this something fixed in Version 2.0?