I'm executing a R script via Python's os.system() (using Rscript executable
which allow executing R script in the command line). This script makes use
of library that will attempt to load up Tcl/Tk interface. Though I don't
see anything even if I'm running the commands on Windows interactive R
console, it will attempt to connect to the display server unsuccessfully
during Galaxy's execution (and fail because $DISPLAY is not set). The
program runs just fine since I have the output I wanted. But Galaxy sees
error, and I'm suspecting it's because of this DISPLAY thing.

I don't understand how Galaxy detects something goes wrong. If anything I
thought it's my Python script return code that should matter. But how does
Galaxy know?! And how do I fix it?

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