Sql Safe Error:Cannot access a closed file

Im using sql safe for backup tool, in one of my sql intances SQL2005 only when saving the trasaccion log sql safe report this error:

1 [SQLSTATE 42000] (Error 50000) xp_ss_backup did not complete. An error(0,1) was encountered, please check the parameters and their values. SQLsafe Freeware Edition CLI Version 4.5.515.5641 Copyright

(c) 2004-2007 BBS Technologies, Inc., All Rights Reserved.

<http://www.idera.com/> Cannot access a closed file. [SQLSTATE 01000] (Error 0). The step failed.

Any help?