Hi @akhtarameen !!
I was looking for your issue and looks like is not directly related to Knime. Most probably is that the error comes from and incompatibility for some packages used by Tensorflow.
Check this post. TFLite int8 quantization failure in TensorFlow 2.7.0 · Issue #52954 · tensorflow/tensorflow · GitHub
take a look here (TypeError: EndVector() takes 1 positional argument but 2 were given · Issue #51590 · tensorflow/tensorflow · GitHub) where some of the users got a solution downgrading some packages. You can do this in your Python environment directly.
Hope it gives you a way to solve the problem.
Best regards.