Catenary Arches

Hello Everyone!

Initially the file was working and I could see the catenary arches but now whenever the file is opened after it being closed an error message pops up on the kangaroo physics component stating:

1. Solution expection: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Are the number of divisions too large? Should it be a smaller range? 

Every time I start from scratch the kangaroo physics works, but doesn't run after I close the file and try to run it again. 

Thank you very much for your time and I'd really appreciate the help.

Sincerely, 
Alexandra