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Hi everyone,  I am using bio3d package for some sequence analysis because of its nice integrated MUSCLE execution. However, I have been encountering some errors while I was running seqaln function, which calls for installed MUSCLE program. In my case, I stored the MUSCLE program on the desktop with pathway of "./Desktop/muscle/src/muscle". I had no problem running MUSCLE directly from terminal. However, when I'm calling the exepath in R, it keeps giving me error messag...