Hi
When I try to deploy a sandbox solution I get an error
The element 'Solution' in namespace 'http://schemas.microsoft.com/sharepoint/' has invalid child element 'CodeAccessSecurity' in namespace 'http://schemas.microsoft.com/sharepoint/'. List of possible elements expected: 'FeatureManifests, Assemblies, ActivationDependencies' in namespace 'http://schemas.microsoft.com/sharepoint/'.
It appears to be in Package.Template.xml
<Solution xmlns="http://schemas.microsoft.com/sharepoint/">

<CodeAccessSecurity>
    <PolicyItem>