Error: Creating Adhoc report with Sql Serverconnection

Hi,

I created a JNDI connection in Admin Console for a SQL Server 2008 R2 database with JTDS driver 1.2.4. Test connection was successful. But when I try to create adhoc-report in BI Serve. I get the error message like below:

Pentaho error: "unable to generate model: java.lang.runtimeException: Jdbc URL jdbc:jtds;SqlServer..... does not start with jdbc:jtds:SqlSever..."

Please jelp me.