I am currently work on a research project which requires parallel technique. I have successfully adapted an Rmpi code from the following website. http://math.acadiau.ca/ACMMaC/Rmpi/task_pull.R and be able to run my own code now. However, since I am developing my own code which involves many calculations, each time I had an error with my Rmpi code, I got an error message like the following: Error in inherits(x, "data.frame") : object 'mean_chain' not found Calls: write.table -> is.data.frame -> inherits Execution halted I therefore correct the error and re-run the code, the odd thing is that in our cluster, the previous version of my R code is loaded and the new one is just ignored, so I end up with the same error message. I tried to use # R CMD BATCH --no-restore /home/sph/jma/Rmpi/ext2/ext2_pull.R to prohibit the previous version, it does not work. Basically, how can I clean up the cluster if I have an error in my Rmpi code? Thank you very much and I appreciate your help! Best Regards, [[alternative HTML version deleted]]