gerchi152 0 Light Poster

will someone help me on how to solve this error?

The database 'D:\FEB. 29, 2012\WAIS SYSTEM-UPDATED JAN25\WAIS SYSTEM\BIN\DEBUG\WAIS.MDF' cannot be opened because it is version 661. This server supports version 655 and earlier. A downgrade path is not supported.
Could not open new database 'D:\FEB. 29, 2012\WAIS SYSTEM-UPDATED JAN25\WAIS SYSTEM\BIN\DEBUG\WAIS.MDF'. CREATE DATABASE is aborted.
An attempt to attach an auto-named database for file D:\FEB. 29, 2012\WAIS SYSTEM-UPDATED JAN25\WAIS SYSTEM\bin\Debug\WAIS.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

I'm trying to detach my mdf file to mssql server...
any response is appreciated... tnx :)