Mesh loft, multiple profiles

Hi guys.

Im working on a definition that would loft complex crv profiles onto  swarm growth trails. Im having trouble with getting the mesh loft to properly loft all organized crvs.

So currently the script takes 3 profiles crvs and then randomizes the sale before organizing them along a selected crv. I think all the lists are organized correctly but when it gets to mesh loft it gives an error 1. Solution exception:Object reference not set to an instance of an object. I checked and it seems most of the crvs are coming in nule and I can not figure out where the mistake is as it seems all lists before are ordered correctly. 

Any help would be very apreciated

Thanks!