I'm getting a 1026 message ID error when I try to create a package. It indicates there is "No row at position zero". Screen shot attached.

It looks like something may be fishy about your Deployment Data items.  Just looking at the code and the stack trace isn't cluing me in as to what is causing the issue...other than it is possible that the error may be occuring due to a recursive call that attempts to get the children records based on the level specified...or the server cannot be accessed...or something along those lines. 

You might try removing the deployment data items and adding them back one at a time to see where the error is coming from so that we can at least trouble shoot what is causing the error.