Error MetaProSIP: Cant execute R

Hi,

I am trying to run a workflow that has the MetaProSIP node and I get this error,

ERROR MetaProSIP           0:7        Failing process stdout: [Checking R... failed, There was a problem detecting R and/or of one of the required libraries. Make sure you have the directory of your R executable in your system path variable., MetaProSIP took 0.02 s (wall), 0.02 s (CPU), 0.02 s (system), 0.00 s (user).]
ERROR MetaProSIP           0:7        Failing process stderr: [Can't execute R. Do you have R installed? Check if the path to R is in your system path variable.]
ERROR MetaProSIP           0:7        Execute failed: Failed to execute node MetaProSIP

 

I do have R installed and added to the system path variable. Not sure what the problem is.