HHEd -A -D -T 1 -H hmm12/macros -H hmm12/hmmdefs -M hmm13 tree.hed triphones1 

this is giving me the following error :

 ERROR [+2655]  TreeBuildCommand: No stats loaded - use LS command

FATAL ERROR - Terminating program HHEd

what should I do ? I can't find any solution to this