Hi,
If you had generated your training utterances yourself with festival, your probably wouldn't have this problem, so I assume the training utts files were already provided to you. Please provide more information regarding the audio database you are using for training.
You will need to find out how the training utts were originally generated - almost certainly with festival - , and try to use the appropriate options for festival to perform compatible utts generation. You might simply need to select one of the existing voice to set the right options. It seems from your script above that you generate your utts with whatever default settings your festival installation uses, which is almost certainly not going to work.
Depending on the actual front-end (phone set, lexicon...) used, the format of the utts can vary considerably.
If you tell us what database you are using (arctic, maybe?) someone here might be able to provide with you some information on the right options to use.
Hope that helps,
Blaise