Python的VTK库中vtkXMLRectilinearGridReader()不能读取数据如何解决??

Python的VTK库中vtkXMLRectilinearGridReader()不能读取数据如何解决??
问题相关代码,请勿粘贴截图

reader = vtk.vtkXMLRectilinearGridReader()
reader.SetFileName(filename)
reader.Update()
data = reader.GetOutput()
x = vtk_to_numpy(data.GetXCoordinates())
z = vtk_to_numpy(data.GetZCoordinates())
names = ('Travel Time', 'Travel time', 'travel time')
for name in names:
if data.GetPointData().HasArray(name):
break
tt = vtk_to_numpy(data.GetPointData().GetArray(name))
dim = (x.size, z.size)

运行结果及报错内容

2022-05-10 16:29:59.985 ( 23.577s) [ ] vtkXMLReader.cxx:306 ERR| vtkXMLRectilinearGridReader (0000024435F46A90): Error opening file Grid2Drnsp_tt_grid.vtr
2022-05-10 16:29:59.999 ( 23.591s) [ ] vtkExecutive.cxx:753 ERR| vtkCompositeDataPipeline (0000024438C83780): Algorithm vtkXMLRectilinearGridReader(0000024435F46A90) returned failure for request: vtkInformation (0000024438C397A0)
Debug: Off
Modified Time: 5005
Reference Count: 1
Registered Events: (none)
Request: REQUEST_INFORMATION
FORWARD_DIRECTION: 0
ALGORITHM_AFTER_FORWARD: 1

我的解答思路和尝试过的方法
我想要达到的结果