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programmable source failed to import text

ERROR: In C:\glr\builds\paraview\paraview-ci\build\superbuild\paraview\src\VTK\Common\ExecutionModel\vtkDemandDrivenPipeline.cxx, line 668
vtkPVCompositeDataPipeline (000001C99BBC1D70): Input port 0 of algorithm vtkOpenGLTexture(000001C9BBB28410) has 0 connections but is not optional.

# Code for 'Script'

# We will use NumPy to read the csv file.
# Refer to NumPy documentation for genfromtxt() for details on
# customizing the CSV file parsing.

import numpy as np
# assuming data.csv is a CSV file with the 1st row being the names names for
# the columns
data = np.genfromtxt("c:/00yf/dh/time0.txt", dtype=None, names=True, delimiter=',', autostrip=True)
for name in data.dtype.names:
   array = data[name]

   # You can directly pass a NumPy array to the pipeline.
   # Since ParaView expects all arrays to be named, you
   # need to assign it a name in the 'append' call.
   output.RowData.append(array, name)