Dear Park,
what you report is not an error. sdexport command converts the trained classifier into a binary file for our of Matlab execution. It requires libPRSD library which is not part of the free PRSD Lite version that you are using. The library is included in the commercial and full academic version of PRSD Studio (for more details see http://perclass.com/index.php/html/versions/).
If you are interested in evaluating the full version of PRSD Studio, please request a demo at providing your affiliation.
PRSD Studio team looks forward to hear from you,
Carmen
