the publisher is not verified

I am developing a Adobe creative extension using FlashBuilder 4.6. I published the extension to a .zip file using FlashBuilder export function and created a p12 certificate by myself. When installing this .zip file by Adobe Extension Manager CS6, a warning was prompted to show that "publisher is not verified".

I would like to know how to avoid this message and the reason.

1. If my company is not verified by Adobe ?

2. If i created a certificate in a wrong way?

3. If i miss something?

Thanks in advance.