Amazon Web Services EC2 Unable to launch instances: invalid BASE64 encoding of user data

How to fix the following problem when launching an Amazon EC2 Intstance under Eclipse:

“Unable to launch instances:  invalid BASE64 encoding of user data”

I had no idea what this meant and I couldn’t find anything in Google.  So When I saw the dialog had some “user data” I put in there (just a few comments), I took them out.  Just delete anything in the “user data” textbox and launch again.  I never have this problem with the console.  Maybe this is just an Eclipse plug-in bug?