Make sure your build configuration is Phone Release (GCCE) as follows:
The application has been built for the phone when the Build Complete message appears in the Console window.
Inspect the output in the console window, identify any warning and error messages, and fix the errors.
An error reported during a later stage of the process (such as, sis file creation) might be a side effect of an error that occurred during the resource compiler or code compiler or linker stages.