The error below is letting you know that mt is not installed on your system:
changer: got exit: 2 str: 1 Drive not ready after 120 seconds, rewind said "/usr/lib/amanda/chg-zd-mtx: line 392: mt: command not found" amlabel: could not load slot "1": Drive not ready after 120 seconds, rewind said "/usr/lib/amanda/chg-zd-mtx: line 392: mt: command not found" amlabel: could not load slot "1": Drive not ready after 120 seconds, rewind said "/usr/lib/amanda/chg-zd-mtx: line 392: mt: command not found"
Solution is to download and install mt on your system:
[root@vmfc5 ppragin]# rpm -ivh mt-st-0.9b-2.2.1.i386.rpm Preparing... ########################################### [100%] 1:mt-st ########################################### [100%]