Redfield BERT nodes: Error while updating

I tried to update/install the Redfield BERT nodes and Redfield NLP nodes. This was not successful and I got the following message:

ERROR PythonGatewayTracker Found running Python processes. Aborting them to allow installation process. If this leads to failures in node execution, please restart those nodes once the installation has finished

Does anyone know how to solve this problem? I have installed KNIME 5.2.4