Package installation Failed IIS 8

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IIS8

Hi..
This error has comes after Change grand script replace with Schema and data use current database script.

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The package installation failed.

Details:
An error occurred during execution of the database script. The error occurred between the following lines of the script: "1" and "3". The verbose log might have more information about the error. The command started with the following:
"CREATE USER [NT AUTHORITY\NETWORK SERVICE] FOR LOG"
User, group, or role 'NT AUTHORITY\NETWORK SERVICE' already exists in the current database. http://go.microsoft.com/fwlink/?LinkId=178587
User, group, or role 'NT AUTHORITY\NETWORK SERVICE' already exists in the current database.

Somebody help me.

Thanks In advance.