AddCampaigns on sandbox fails with -100699?

There is no reference of this error code that I can find in the documentation... does anyone know what this error means?
[121 byte] By [dmartindale] at [2008-1-4]
# 1
We made some adjustments on the Sandbox yesterday 6/11, and we're not seeing the -100699 errors now. Please try again.

Jeff Dillon, Microsoft adCenter API Technical Support

JeffDillon-MSFT at 2007-10-3 > top of Msdn Tech,Windows Live Developer Forums,Microsoft adCenter: Development...

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