Cable tray support node getting error

hii, i am new in dynamo.i am trying to place support for cable tray.its not working. i don’t know where i was mistaked.kindly help me.this code orgin from bim guru. i little bit modified.
bim guru cable traySupports.dyn (131.0 KB)
ABG_GEN_Unistrut-Hanger_R20.rfa (512 KB)
lighting-linked.rvt (5.5 MB)