Error during generating the Doxygen document

I got this problem during generating the Doxygen document:

Problems running dot: exit code=127, command='dot', arguments='"/home/AAA/src/html/ABC_8hpp__incl.dot" -Tpng -o "/home/AAA/src/html开发者_Go百科/ABC_8hpp__incl.png" -Tcmapx -o "/home/AAA/src/html/ABC_8hpp__incl.map"'
sh: dot: not found

Gave the output is like this for the constructor:

{
  namespace applicationTest
  {   

Has anyone had this problem before?

Do you have dot installed on the machine? Do you want to use it to generate the graphs?

If not, set the HAVE_DOT option to "no".

If yes, make sure dot is in the path, or set its location with the DOT_PATH option.