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I checked your input file but you did some mistake in your FreeCAD model. There appears to be a dangling node "NFHNode041" as per FreeCAD Combo Model View. It reflects in your FastHenry created input file, as the spiral stops at node NFHNode040
EFHPath38 NFHNode039 NFHNode040 w=0.2 h=0.2
EFHPath39 NFHNode040 NFHNode w=0.2 h=0.2
.external NFHNode044 NFHNode043
so you spiral actually never closes in a loop, and this causes FastHenry to find no valid path for the current, hence the error.