However, if you have never successfully uploaded an APK to Google play, it is not too late to start again.
In /sdcard/DroidScript/APKs there is a file called user.keystore
Use your file manager to delete that file.
You will then be able to build an APK as if you had never created one before.
HOWEVER, please note that once you have uploaded an APK, you will only be able to use the same keystore again.
So read the warning that comes up when you create your first release-mode APK. Back up your keystore and remember the password. THIS IS VITAL.