print dies halfway through with "last line number error"

i set up my solidoodle last night to do a long print.  this is the print i started using KISSslicer for.  it is a superhero type figure with a short cape that ends at the waist.  the cape sticks out from the body at about a 30 degree angle.  i mention that because the cape is what seems to give me the most problem.  when KISSlicer made the gcode it put a suppport structure at the waist to the end of the cape that looks almost like a second raft.  last night when it started printing that part it died with the line number not last line number +1.  can anyone think of what i might be doing wrong?