<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_error_output_file(filename):
 """Sets a file to write out the VTK errors"""

    filename = os.path.abspath(os.path.expanduser(filename))
    fileOutputWindow = vtk.vtkFileOutputWindow()
    fileOutputWindow.SetFileName(filename)
    outputWindow = vtk.vtkOutputWindow()
    outputWindow.SetInstance(fileOutputWindow)
    return fileOutputWindow, outputWindow