tape base backup failure

hi all ,

testing the trail version of Backup Exec 2014 , OS :windows storage server 2012 R2 , tape libary model : DELL TL2000 with single sas drive .

software installation success , disk to disk backup success ,but fail to backup data to disk . the tape libary just load and unload the tape in cycle ,but not writing data . error show up like the screenshot attached .

the tape libary's encryption software is installed ,will it impact ?

have a nice day to you all !

Best Regards,

Nicolas