It only says Segmentation fault and aborts the program.
I called dot using: $ dot -Tgif generateHierachy.txt -o result.gif
If I remove the definition of the edges from the file, dot prints the following to the screen but it generates an outputfile: Error: Could not find/open font: Times in /... (list of dictionaries)
If I remove some of the edges from the edn of the file dot aborts
lt-dot: mincross.c:964: transpose_step: Assertion `(v)->u.order < (w)->u.order' failed.
Input file: b487.dot