Let's print a stack trace when there's an error in the completeCallback, it could be a ways inside it and we want to help people debug.
Let's print a stack trace when there's an error in the completeCallback,
it could be a ways inside it and we want to help people debug.


git-svn-id: a1a4b28b82a3276cc491891159dd9963a0a72fae@4970 542714f4-19e9-0310-aa3c-eee0fc999fb1

threerings/narya,threerings/narya,threerings/narya,threerings/narya,threerings/narya