Invalid SWC file using ADT to create an Android Native Extension

I'm following a tutorial on youtube:

https://www.youtube.com/watch?v=dfq9wiuLks4

Using Flash Builder 4.6 and and when I get to the point where the project is supposed to be built using adt I run into the following error:

"Invalid swc file:"

Here is the command I'm using:

adt -package -storetype PKCS12 -keystore newcert.p12 -storepass mypassword -tsa none -target ane notifications.ane build/ane/Notifications.swc -platform Android-ARM -C build/ane/Android-ARM

Ive tried setting the Additional Compiler Arguments in the Flex Library Compiler to this: "-locale en_US -swf-version 19"

Still the same result, If anyone can help me figure out how to trouble shoot this or isolate the problem I would greatly appreciate it.

Thanks