When i run command:

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

i got this error:

Creating HMMset using trees to add unseen triphones
  ERROR [+2662]  AddUnseenCommand: there are no existing trees
 FATAL ERROR - Terminating program HHEd

how to solve this.

thanks in advance...