Azure Publish error, The Directory is not empty.

Hi, though  not always , I keep getting the error The Directory is not empty, when i try to publish my azure project, and publish fails, nothing I do, like clean, build rebuild, solution , role or cloud project helps. Please help.

Error    150    The directory is not empty.
    C:\Program Files\MSBuild\Microsoft\VisualStudio\v10.0\Windows Azure Tools\1.4\Microsoft.WindowsAzure.targets    2854    5    MyCastingAzure

<CSPack
      ServiceDefinitionFile="@(TargetServiceDefinition)"
      Output="@(PublishServicePackage)"
      PackRoles="@(Roles)"
      SiteMapping="@(SiteMapping)"
      RoleProperties="@(RoleProperties)"
      CopyOnly="false"
      >
    </CSPack>