Attaching a database without its log file

Hello All,

I am trying to attach a database without its log file using the below command.

"CREATE DATABASE TestDb ON
(FILENAME =N'C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\TestDb.mdf')
FOR ATTACH_REBUILD_LOG
GO"

I am getting the below mentioned error..

File activation failure. The physical file name 
"C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\AdventureWorksDW2012_log.ldf" 
may be incorrect.The log cannot be rebuilt when the primary file is read-only.
Msg 1813, Level 16, State 2, Line 1Could not open new database 'TestDb'. CREATE DATABASE is aborted.

please assist.

Thanks in advance

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