Error: /tmp/vkjAfYLRU1.dot: syntax error in line 1 near 'diagraph'

00001: diagraph G {
00002:  main -> parse -> execute;
00003:  main -> init;
00004:  main -> cleanup;
00005:  execute -> make_string;
00006:  execute -> printf;
00007:  init -> make_string;
00008:  main -> printf;
00009:  execute -> compare;
00010: }