Hello
I'm new in the CNC industry.
I have several crown molding figures the machine seller gave me.
He said I could edit the .dxf file in corel to make a file withe multiple shapes instead of only one, then use deskCNC to make the g-code and then cut them using Mach3.
I bought all the softwares needed, and when I load the single crown files he gave me, everything works fine, but after making the new edited file with the various shapes in corel, and exporting it as a .dxf file, when I import it in deskCNC I get the following error:

A SPLINE was detected but not read. Explode all SPLINE'S before loading

I've never used these softwares before, so I'm a bit confused and frustrated.

I would really appreciate it if anybody can help me out.
I'm using Corel Draw X4, deskCNC, and Mach3.
Thank you very much and please excuse my bad english (I'm from Colombia, South America)
Santiago