Undefined variable "ChannelDataSourceScope" or class "ChannelDataSourceScope.Viewport".

```MATLAB

Undefined variable "ChannelDataSourceScope" or class
"ChannelDataSourceScope.Viewport".

Error in SmartScopePlot (line 21)
     d =
     scope.DataSourceScope.LatestDataPackage.GetData(ChannelDataSourceScope.Viewport,
     AnalogChannel.ChA);
```

Smart-Scope is connected over USB SmartScopeConnect.m has been successfully been executed