I am using the excel macro linked below to plot a line from a set of co-ordinates.

I have been trying to extrude this line to a defined thickness so that i can save it as an .IGS file to import in to ANSYS Workbench.

When I try to extrude it I get the following error:

The sketch has not been updated because solving it would result in invalid geometry(such as a zero length line)

Consider: Deleting the invalid Geometry

                 Changing the relations or dimensions.

As far as I am aware there is no invalid geometry. There is no repeating points and it is a closed curve(The line I have plotted is an airfoil).