1 index was ouside the bounds of the array error in K2 BP when running a simple process

I have a simple email process I am testing.  the process simply sends an email stating this is a k2 test (to and from the same account).  the account running the process has full permissions to the process. When the process is run the error:  "1 index was ouside the bounds of the array" pops up in a error window.  This error is also displayed on the K2 console.

Any ideas?

Thanks in advance.