<p>Hi there,</p>

<p>When did you build the model, and did you update your mlpack build since you built the model?  There were recently some changes in the git master branch with how the HMMs were saved, which could make an old model incompatible with the new version of the <code>hmm_*</code> executables.  Does building a new model with <code>hmm_train</code> and then using <code>hmm_viterbi</code> with that solve the issue?</p>

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