I use maven-gae-plugin to deploy my app, it works find until i decide to deploy it to another app-id under different Google account. i met the \"This applciation does not exist\
What IDE are you using? If it's Eclipse you need to make sure you're logged into your Google account in Eclipse before trying to deploy, or you will get that error.
Alternatively, make sure your new Google account is authorized to deploy by the admin of the GAE account AND the web admin if you get your Google account through a company/organization. For example my school gmail account does not allow me to be an admin for GAE.