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It seems like there's a non-ascii character (probably š) in one of the file names of one of the files on your system, and the python library for dealing with paths and filenames (os.path.isdir) doesn't like that.

I realize that's not very specific, but without modifying roslaunch to add additional debug information, there's not much more I can say.

You can search for files with that character in the file name in /opt/ros with find /opt/ros -name '*š*'. If that doesn't find anything, you can try searching the whole file system: find / -name '*š*' (give this an hour or two to run if you have a large file system, a slow hard drive, or both)