Could not download and install appl

Could not download and install
application. Error: Unable to install
this application because an application
with the same identity is already
installed. To install this application,
either modify the manifest version for this application or uninstall the
preexisting aplication.

ผลลัพธ์ (อังกฤษ) 2:

Could Not download and Install
Application. Error: Unable to Install
this Application because an Application
with The Same Identity is Already
installed. To Install this Application,
The MANIFEST either modify or Uninstall The Application Version for this.
preexisting Aplication.