Jar File will not open

I love your product!
Thank you very much!

Unfortunately, I'm probably doing something wrong, and I'm having difficulty figuring out how to correct it.
I'm using Intellij IDEA 13 CE SDK 1.6 (java version 1.6.0_65) and I have not been able to make a jar file that I can open with jar launcher 14.9.0

I opened the project structure
created a Certificate
the manifest file contains:
Manifest-Version: 1.0
Main-Class: MyAllegroClassy
I added a Main Class

I Build>Build Artifacts
The Jar file is generated

When I try to launch the jar file I see the following message:
6/29/14 2:00:30.777 PM [0x0-0x49049].com.apple.JarLauncher: Error: Could not find or load main class MyAllegroClassy

Any help would be greatly appreciated.

Thanks,
Mike