activitypointer with id does not exist

var accessOptions = {};
    //accessOptions = GetGlobalContext().getQueryStringParameters();
    //alert(accessOptions.typename);
    accessOptions.principalEntityName = "systemuser";
    accessOptions.principalEntityId = Xrm.Page.context.getUserId();
    accessOptions.targetEntityName = parent.Xrm.Page.data.entity.getEntityName();
    accessOptions.targetEntityId = Xrm.Page.data.entity.getId();

    var principalAccess = XrmServiceToolkit.Soap.RetrievePrincipalAccess(accessOptions);