# vtkScalarBarActor New macro problem
**URL:** https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610
**Category:** Development
**Created:** [March 26, 2019, 5:55pm UTC](https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610 "2019-03-26T17:55:12Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@ramon.j.moral](https://discourse.vtk.org/u/ramon.j.moral)
#### Post date: [March 26, 2019, 5:55pm UTC](https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610/1 "2019-03-26T17:55:12Z")
Hello,
I am using QtCreator to make a vtk App. I wanted to make a section of the app that shows the vtkScalarBarActor so the USER can get a feeling for the colors their going to use for their state plot.
I have two lines in the showEvent handler for the QVTKOpenGLWidget were the color bar will live:
vtkSmartPointer lut = vtkSmartPointer::New();
vtkSmartPointer bar = vtkSmartPointer::New();
So there is no problem with the vtkLookupTable. But the vtkScalarBarActor throws the following:
/usr/local/vtk-8/include/vtk-8.2/vtkSmartPointer.h:155: error: undefined reference to `vtkScalarBarActor::New()’
Any ideas? Any help is greatly appreciated.
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### Author:  [@ramon.j.moral](https://discourse.vtk.org/u/ramon.j.moral)
#### Post date: [March 26, 2019, 6:56pm UTC](https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610/2 "2019-03-26T18:56:19Z")
I am sorry I forgot the first part of the error:
/home/rmoral/Documents/dev/Qt/build-igvnapp-Desktop-Debug/igcolorbarviewer.o:-1: In function `vtkSmartPointer::New()’:
Thank you again.
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### Author:  [@allison.vacanti](https://discourse.vtk.org/u/allison.vacanti)
#### Post date: [March 26, 2019, 10:07pm UTC](https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610/3 "2019-03-26T22:07:02Z")
`vtkScalarBarActor::New()` is defined in the `vtkRenderingAnnotation` library – make sure you’ve linked this library to your application.