Problems with Slave Setup Plugin

[jhavero]

I'm using Amazon EC2 plugin to spin up my slave and the Slave Setup Plugin to run some pre-launch scripts.
For the pre-launch script I have "./pre-launch.sh" and for prepare script I have "./prepare.sh". I checked
both these scripts are exiting 0 and are stored in the Jenkins home directory of the Jenkins master.

When the slave starts up I get these errors:

executing pre-launch scripts ...
script failed with exception: null
.
.
.
executing prepare script ...
script failed with exception: null

My versions:

Slave Setup Plugin 1.8
Amazon EC2 plugin 1.24
Jenkins 1.597

[Mike Sinn]

I had this problem and creating a new node and deleting the old one magically fixed it somehow.