We had been using the slave-setup plugin for a while (v1.6), and it has worked well.

We upgraded to v1.8, and it no longer appears to work. I have attached the system configuration and the node configuration.

The build log says:

{{just before slave ChrisTest gets online ...
executing prepare script ...
script failed with exception: null
setting up slave ChrisTest ...
Slave NOT set up as prepare script was not executed successfully.
slave setup done.
Slave successfully connected and online}}