The problem arises from the line "LeftHeel=fig.Name()" LeftHeel is just a string.
Replace the lines

fig=scene.CurrentFigure()
LeftHeel=fig.Name()

and

fig=scene.CurrentFigure()
RightHeel=fig.Name()

with

LeftHeel=scene.CurrentFigure()

and

RightHeel=scene.CurrentFigure()

This will make sure that LeftHeel and RightHeel are figure objects, not strings. Figure objects have a SetConformTarget method.
Since SetConformTarget takes a figure object as argument, you also should change the line

JoJo=fig.Name()

into

JoJo=scene.CurrentFigure()

Hope this helps,

Steven.

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