Maybe you have to install that also. Not sure if this is a dependency that should have been installed automatically:
conda install -c conda-forge textract
You might want to check if Python 3.6 is the right version for you you could try and use 3.9 which should be supported by KNIME-. I would list all the packages you need in a YAML file and maybe create a new Environment. Anaconda or Miniconda should make sure that the versions would match. Sometimes there can be differences even between the standard Anaconda and conda-forge repositories. So maybe stick to one. I prefer to use conda-forge since at the moment it also appears to be the ‘free’ version.