Can't Upload File To App Engine "list Index Out Of Range"

I am trying to updload a picture from a Phonegap application to my Python App Engine project. The phone app trys to upload the file but App engine returns a 'list index out of ran

Solution 1:

You need to generate the upload url via blobstore.create_upload_url('/upload'). Right now you are making a multi-part POST directly your upload handler url. The intermediate url is critical because it generates a Blobstore key and adds it to the MIME header before passing it to the handler.

Solution 2:

I don't know anything about PhoneGap (what is it?) but that Python code is expecting your file to be sent via HTTP POST attached to a field named file. Presumably, PhoneGap isn't sending it against that field.