I am working on Salesforce Touch; I am new with this platform. I am referring to the Salesforce Touch guide. I am trying to create a native Android project, using this command

    ant create_native -Dapp.name={DemoApp} -Dtarget.dir={C:\Anu Raj\project\Salesforce Touch} -Dpackage.name={com.acme.mobileapp}"


but i am getting this error while doing this --- > "

    ant : Parameter -command is specified already.
    At line:1 char:4
    + ant <<<<  create_native -Dapp.name={DemoApp} -Dtarget.dir={C:\} -Dpackage.nam
    e={com.acme.mobileapp}
    + CategoryInfo          : InvalidArgument: (:) [], ParameterBindingExcepti
    on
    + FullyQualifiedErrorId : ParameterSpecifiedAlready



can anybody tell me what is the issue for this.