# Error connecting points by Programmable Filter
**URL:** https://discourse.paraview.org/t/error-connecting-points-by-programmable-filter/14832
**Category:** ParaView Support
**Created:** [June 12, 2024, 6:54am UTC](https://discourse.paraview.org/t/error-connecting-points-by-programmable-filter/14832 "2024-06-12T06:54:42Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@emgema](https://discourse.paraview.org/u/emgema)
#### Post date: [June 12, 2024, 6:54am UTC](https://discourse.paraview.org/t/error-connecting-points-by-programmable-filter/14832/1 "2024-06-12T06:54:42Z")
I try to connect points (listed in a table) with a Programmable Filter ([script from here](https://stackoverflow.com/questions/22438140/how-to-connect-points-in-paraview)):
```auto
# the single input table this filter is applied to
table = inputs[0]
# print table properties and metrics just for sure
print("table: ", table)
print("table.GetNumberOfRows() = ", table.GetNumberOfRows())
num_rows = table.GetNumberOfRows()
# usual vtk workflow: fill vtkPoints first
vtkpoints = vtk.vtkPoints()
for i in range(0, num_rows):
vtkpoints.InsertPoint(i,
table.GetValue(i,13).ToFloat(), #x column
table.GetValue(i,12).ToFloat(), #y column
table.GetValue(i,14).ToFloat() #z column
)
vtkpoints.InsertPoint(i,
table.GetValue(0,13).ToFloat(), #x column
table.GetValue(0,12).ToFloat(), #y column
table.GetValue(0,14).ToFloat() #z column
)
output.SetPoints(vtkpoints)
# allocate vtkCell, representing single line
# if more lines, use output.Allocate(N_OF_LINES, 1)
output.Allocate(1, 1)
vtkpolyline = vtk.vtkPolyLine()
vtkpolyline.GetPointIds().SetNumberOfIds(num_rows)
# enumerate points to include in polyline
for i in range(0,num_rows):
vtkpolyline.GetPointIds().SetId(i, i)
# assign vtkPolyLine graphical object to created vtkCell
output.InsertNextCell(vtkpolyline.GetCellType(),
vtkpolyline.GetPointIds())
```
I get this error message:
_Traceback (most recent call last):_
- File “”, line 22, in \*
- File “”, line 3, in RequestData\*
_TypeError: ‘NoneType’ object is not subscriptable_
_ERROR: In vtkTableToPolyData.cxx, line 83_
_vtkTableToPolyData (0x61dfbabfd540): Failed to locate the columns to use for the point coordinates_
_ERROR: In vtkExecutive.cxx, line 729_
_vtkPVCompositeDataPipeline (0x61dfbafa7040): Algorithm vtkTableToPolyData (0x61dfbabfd540) returned failure for request: vtkInformation (0x61dfbc0534c0)_
- Debug: Off\*
- Modified Time: 1424465\*
- Reference Count: 1\*
- Registered Events: (none)\*
- Request: REQUEST\_DATA\*
- FROM\_OUTPUT\_PORT: 0\*
- ALGORITHM\_AFTER\_FORWARD: 1\*
- FORWARD\_DIRECTION: 0\*
_Traceback (most recent call last):_
- File “”, line 22, in \*
- File “”, line 3, in RequestData\*
_TypeError: ‘NoneType’ object is not subscriptable_
- File “”, line 6\*
- for i in range(0, numPoints-1):\*
_IndentationError: unexpected indent_
_Traceback (most recent call last):_
- File “”, line 22, in \*
_NameError: name ‘RequestData’ is not defined_
_Traceback (most recent call last):_
- File “”, line 22, in \*
- File “”, line 3, in RequestData\*
_TypeError: ‘NoneType’ object is not subscriptable_
Can you tell me what goes wrong?
I’m using:
Client Information:
Version: 5.12.1-1101-g3094ac888d
VTK Version: 9.3.0-3270-g66096615a1
Qt Version: 5.15.8
vtkIdType size: 64bits
Embedded Python: On
Python Library Path: /home/emanuel/miniforge3/lib/python3.11
Python Library Version: 3.11.9 | packaged by conda-forge | (main, Apr 19 2024, 18:53:30) [GCC 12.3.0]
Python Numpy Support: Off
Python Matplotlib Support: Off
Python Testing: Off
MPI Enabled: On
Disable Registry: Off
Test Directory:
Data Directory:
SMP Backend: TBB
SMP Max Number of Threads: 12
OpenGL Vendor: AMD
OpenGL Version: 4.6 (Core Profile) Mesa 23.2.1-1ubuntu3.1~22.04.2
OpenGL Renderer: RENOIR (renoir, LLVM 15.0.7, DRM 3.54, 6.5.0-1023-oem)
Accelerated filters overrides available: No
Connection Information:
Remote Connection: No
---
### Author:  [@emgema](https://discourse.paraview.org/u/emgema)
#### Post date: [June 12, 2024, 8:40am UTC](https://discourse.paraview.org/t/error-connecting-points-by-programmable-filter/14832/2 "2024-06-12T08:40:35Z")
I got it working. The problem was a wrong python path which led to my Anaconda environment and not to the system python.
I rebuild paraview using the system python and everything works…
---
### Author:  [@lastairbender](https://discourse.paraview.org/u/lastairbender)
#### Post date: [July 15, 2024, 6:50pm UTC](https://discourse.paraview.org/t/error-connecting-points-by-programmable-filter/14832/3 "2024-07-15T18:50:19Z")
Hi, I am facing a similar error in line 729 however, I am unable to interact with the window that shows the error, how can i do that?
