Log shipping Backup job failed

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SQL

SQL-Server-2008R2

Hi,

I configured log shipping for four databases(SQL 2008r2) and for two databases the LS jobs are running successfully. Another two databases backup job was failed and the error is below.

Message:

2014-05-19 08:15:00.68 *** Error: Backup failed for Server 'SERVERNAmE'. (Microsoft.SqlServer.Smo) ***
2014-05-19 08:15:00.71 *** Error: An exception occurred while executing a Transact-SQL statement or batch.(Microsoft.SqlServer.ConnectionInfo) ***
2014-05-19 08:15:00.71 *** Error: BACKUP LOG cannot be performed because there is no current database backup.
BACKUP LOG is terminating abnormally.(.Net SqlClient Data Provider) ***

I took diff backup and applied on it to continue log chain but next day the job failed again with the same error.I observed for 3 days but it failed again and again.

NOTE:All the databases having the same configuration.

please help me on this.

Thanks,
Sree.