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In a batch of three files, this was returned when POSTing the final one. 

{"error":{"code":"invalid-session-key","info":"Not a valid session key"}}


1) how does this happen? if we made it through the first stage, surely we have a valid session key.
2) Also, the error was not handled, instead we blocked on all the files.



Here's the contents of the POST (although it's probably irrelevant, the others had similar contents and they worked).

action	upload
filename	UploadWizard-0.1-14-use.png
format	json
sessionkey	4j117az9oqk5j1yo3ndrvp32x9zc1fn.png
summary	User created page with UploadWizard (alpha)
text	=={{int:filedesc}}== {{Information |description={{en|1=Final thank you page with links to show how to use these files, in version 0.1 of the Wikimedia Commons UploadWizard. Browser: Mozilla Firefox 3.6.12, Mac OS X version.}} |date=2010-11-30 |source=http://commons.wikimedia.org/wiki/Special:UploadWizard |author=Wikimedia Foundation |permission= |other_versions= |other_fields= }} =={{int:otherinfo}}== {{free screenshot}}=={{int:license-header}}== {{Cc-by-sa-3.0}} [[Category:Uploaded with UploadWizard]] [[Category:Screenshot]] [[Category:UploadWizard-0.1]]
token	55287cfcb111ff4f0dba1be45469cb02+\