Split line not working for splitting simple formed piece into 4 parts

Good afternoon All,

I'm trying to use "split line" on one of my projects.  I've never used it before but from what I've read, it seems simple but nevertheless is not working for me.  I basically have a long formed part which I need to break up into 4 pieces so the pieces can fit in our press brake (need split at each plane).  I made one sketch line for starters following the profile of the outside of part.  I keep getting errors within the split line dialog box.  Perhaps someone can offer a solution to what I'm doing wrong?  I've also attached the part.  Thanks in advance!

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