Thanks Erel, but I think I'm a little wrong.
To create the keystore I used the app B4A. But the file extension is ".Keystore".
In order to compile the app as requested by the tuturial, I have to use a file ".ks" extension.
I've only known him out with apptomarket app.
In order to compile as is indicated in the tutorial, I have to enter myapp.apk files, and zipalign.exe mykeystore.ks in the same folder where I have Java installed (c: \ programs .. \ java \ jr7 ... \ bin \) to run with the command prompt. This works fine, but when I want to install on any smrtphone still the same error.
I think it's because it is not made with mykeystore.ks apptomarket ...