R cannot be initialized. Exception occured during R initialization. on MacOS

Hi team,

I’m trying to add an R node to my workflow, but R Source is not working. I have this error message:

“R cannot be initialized.
Exception occurred during R initialization.”

I’m using a Mac with macOS Catalina 10.15.4

Hope you can help me! :slight_smile:

Hello @rube22,

Did you install R on your MAC? Here is our guide on how to setup R with KNIME https://docs.knime.com/2020-07/r_installation_guide/index.html. Let me know if you have gone through this steps already and the version of KNIME you are using.



Hi @cpadilla

yes, I did it again and now I have the error (I’m using KNIME 4.2.0):

ERROR: Could not execute internal command.ERROR: R evaluation failed.: "sapply(ls(),function(a)class(get(a,envir=globalenv()))[1])"ERROR: R evaluation failed.: "sapply(ls(),function(a)class(get(a,envir=globalenv()))[1])"ERROR: eval failed

The only thing that I did differently is that I used:


instead of


What version of Rserve are you using? I am going to send you a script that has helped other users that have MacOS and R. Please send me an email to cynthia.padilla@knime.com

Once you have the script then you can do the following:

  1. Run R:


  1. Run the script

Here is a workflow where you can check your version of RServe and links to some articles. You will have to make sure you run RServe version 1.8.6.

1 Like

@cpadilla @mlauber71 thank you :slight_smile: Now it works!


This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.