DB13 there is no current database backup

Hi people,

I´ve scheduled in DB13, the full database backup and transaction log backup. I´ve scheduled of this way:

For example,

friday, Full backup

saturday, transaction log backup

In the log appear this error message:

Duration: 0 hours(s) 0 min(s) 0 sec(s)

Last msg: Executed as user: NT AUTHORITYSYSTEM. BACKUP LOG cannot be performed because there is no current database backup. (Error 4214) BACKUP LOG is terminating abnormally. (Error 3013) DBCC execution completed. If DBCC printed error messages, contact your system administrator. (Error 2528). The step failed.

If i do the backup and after that the transacction log in the same day, all it´s correct.