Cannot create air file because certification has expired

I followed this tutorial and got problem that certificate has expired.

I looked up in Air forum an开发者_如何学Pythond found http://forums.adobe.com/message/2320586#2320586 which says the same problem that I got. Unfortunately, it has not been solved.

I am looking forward to your suggestion.

For development purposes, you can generate a basic, self-signed certificate with ADT or another certificate generation tool. You can also buy a commercial code-signing certificate from a commercial certificate authority such as VeriSign or Thawte.

If you need a self signed certificate, you can create one from Flex Builder or the SDK. If you are using a commercial certificate, you might have to pay to extend it.