this content database has a schema version which is not supported in this farm sharepoint 2010

we are getting the below error,

this content database has a schema version which is not supported in this farm sharepoint 2010

we have taken the backup of the web application and we have formatted the server and reinstalled the same softwares including the sql server.

The back up restored to the Db successfully, but when we trying to add the content db to the web application it is throwing the schema error, we have added the content db through powershell, stsadm and central admin also.

please reply if any one know the answer.